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X+6 = (-2/3)*(x+1) // - (-2/3)*(x+1)
X-((-2/3)*(x+1))+6 = 0
(2/3)*(x+1)+X+6 = 0
2/3*(x+1)+X+6 = 0
2/3*(x+1)+X+6 = 0
X+2/3*x+2/3+6 = 0
X+2/3*x+20/3 = 0
X+2/3*x+20/3 = 0
X+2/3*x+20/3 = 0 // - X+20/3
2/3*x = -(X+20/3) // : 2/3
x = (-(X+20/3))/2/3
x = -3/2*(X+20/3)
x = -3/2*(X+20/3)
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