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-9x -4x +8 = 3x -2x -10
-9x -4x -3x +2x = -10 - 8
-14x = -18 ⇒ -18 / -14 ⇒ x = 9/7
2.-x-2(-x+1)=3(x+1)-2(x+4)
-x +2x -2 = 3x +3 -2x -8
-x +2x -3x +2x = +3 -8 +2
0x = -3 ⇒ Math error
3.-4(2x-3)+10-5x=1-2(x-6)
-8x + 12 +10 -5x = 1 -2x +12
-8x - 5x+2x = 1 + 12 -12 -10
-11x = -9 ⇒ x = 9/11