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2-(x-3x+12)=5
2-x+3x-12=5
2x=5-2+12
2x=15
x=15/2
x=7 1/2
5(2-x)=10-[4+3(x-3)]
10-5x=10-(4+3x-9)
10-5x=10-4-3x+9
-5x+3x = 10-4+9-10
-2x=5
x=-2 1/2
1-[5(x+2)-7]=6(-x-3)
1-(5x+10-7)= -6x-18
1-5x-10+7 = -6x-18
-5x+6x = -18-1+10-7
x= -16