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2x+5-3x+7=8x+12
2x-3x-8x=-5-7+12
-9x=-12+12
x=0/+-9
x=0
2(3+3x) - 3(1-3x)= -2
6+6x-3+9x=-2
6x+9x=-6+3-2
15x=-5
x=-5/15 (simplificamos)
x=-1/3
5(3-2x) - 10=4 (2-3x)+6
15-10x-10=8-12x+6
-10x+12x=-15+10+8+6
2x=24-15
2x=9
x=9/2
x=4.5
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