A.
[tex]3x-8 = 2x+4\\\\3x-2x = 4+8\\\\\boxed{x = 12}[/tex]
B.
[tex]4x-3(3x-5) = 6x+4\\\\4x-9x+15 = 6x+4\\\\-5x-6x = 4-15\\\\-11x = -11 \ \ \ /:(-11)\\\\\boxed{x = 1}[/tex]
C.
[tex]5x-6(x+7) = 7x-9(-10+x)\\\\5x-6x-42 = 7x+90-9x\\\\-x+2x = 90+42\\\\\boxed{x = 132}[/tex]
D.
[tex]2x-(3-2x) = 5+x\\\\2x-3+2x=5+x\\\\4x-x = 5+3\\\\3x=8 \ \ \ /:(3)\\\\\boxed{x = \frac{8}{3} = 2\frac{2}{3}}[/tex]
E.
[tex]9x+3 = 7(x-2)+17\\\\9x+3 = 7x-14+17\\\\9x+3 = 7x+3\\\\9x-7x = 3-3\\\\2x = 0 \ \ \ /:2\\\\\boxed{x = 0}[/tex]
F.
[tex]\frac{12-x}{4} = \frac{x+4}{2} \ \ \ |\cdot 4\\\\4\cdot\frac{12-x}{4} = 4\cdot\frac{x+4}{2}\\\\12-x = 2(x+4)\\\\12-x = 2x + 8\\\\-x-2x = 8-12\\\\-3x = -4 \ \ \ /:(-3)\\\\\boxed{x = \frac{4}{3} = 1\frac{1}{3}}[/tex]
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A.
[tex]3x-8 = 2x+4\\\\3x-2x = 4+8\\\\\boxed{x = 12}[/tex]
B.
[tex]4x-3(3x-5) = 6x+4\\\\4x-9x+15 = 6x+4\\\\-5x-6x = 4-15\\\\-11x = -11 \ \ \ /:(-11)\\\\\boxed{x = 1}[/tex]
C.
[tex]5x-6(x+7) = 7x-9(-10+x)\\\\5x-6x-42 = 7x+90-9x\\\\-x+2x = 90+42\\\\\boxed{x = 132}[/tex]
D.
[tex]2x-(3-2x) = 5+x\\\\2x-3+2x=5+x\\\\4x-x = 5+3\\\\3x=8 \ \ \ /:(3)\\\\\boxed{x = \frac{8}{3} = 2\frac{2}{3}}[/tex]
E.
[tex]9x+3 = 7(x-2)+17\\\\9x+3 = 7x-14+17\\\\9x+3 = 7x+3\\\\9x-7x = 3-3\\\\2x = 0 \ \ \ /:2\\\\\boxed{x = 0}[/tex]
F.
[tex]\frac{12-x}{4} = \frac{x+4}{2} \ \ \ |\cdot 4\\\\4\cdot\frac{12-x}{4} = 4\cdot\frac{x+4}{2}\\\\12-x = 2(x+4)\\\\12-x = 2x + 8\\\\-x-2x = 8-12\\\\-3x = -4 \ \ \ /:(-3)\\\\\boxed{x = \frac{4}{3} = 1\frac{1}{3}}[/tex]