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5x-6x+[8-x]} = -2x+1
x+7x=-2x+1
x+2x= 1-7
3x=6
x=2
-x + [7 + x] = -2x + 1
-x + 7 + x = -2x + 1
7 = -2x + 1
2x = -6
x = -3