Resposta :

eluciamonteiro
a) x - 11 + 8x - 7 + 4 = 6X - 9 + 3x -x
x+8x-6x-3x+x= -9+11+7-4
x+8x+x-6x-3x=-9-4+11+7
10x -9x= -13 +18
x= +5

2 - [x + (-7 + 4x)] = -(8+6x-3x) + 1
2- [x - 7 +4x] = -8 -6x +3x +1
2-x+7 -4x= -8 -6x +3x +1
-x -4x +6x -3x= -8 +1 -7-2
-x-4x-3x +6x= -8 -7-2+1 
-8x +6x= -17+1
-2x= -16(-1)
+2x=+16
x=16/2
x= 8



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