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X+4 = (-3*x-7)/2 // - (-3*x-7)/2
X-((-3*x-7)/2)+4 = 0
(-1*(-3*x-7))/2+X+4 = 0
(-1*(-3*x-7))/2+(2*X)/2+(2*4)/2 = 0
2*X-1*(-3*x-7)+2*4 = 0
2*X+3*x+7+8 = 0
2*X+3*x+15 = 0
(2*X+3*x+15)/2 = 0
(2*X+3*x+15)/2 = 0 // * 2
2*X+3*x+15 = 0
2*X+3*x+15 = 0 // - 2*X+15
3*x = -(2*X+15) // : 3
x = (-(2*X+15))/3
x = (-(2*X+15))/3
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