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3x-7+15x < 8-6+30x
18x-30x < 2+7
-12x < 9
x > - 9/12
x > -3/4
b) x+5-(17-3x) > -6+7(2x-3)
x+5-17+3x > -6+14x-21
4x-14x > -27+12
-10x > -15
x < 3/2
c) -2(3-x)(2x-1)-(3-2x)(-2x+4) > 3x-6
(-6+2x)(2x-1)-(-6x+12+4x^2-8x) > 3x-6
-12x+6+4x^2-2x-(-10x+12+4x^2) > 3x-6
-14x+6+4x^2+10x-12-4x^2 > 3x-6
-4x - 6 > 3x-6
-4x-3x > -6 + 6
-7x > 0
x < 0