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3-(2*(1-x)) = (5/7)*(x-3) // - (5/7)*(x-3)
3-(2*(1-x))-((5/7)*(x-3)) = 0
(-5/7)*(x-3)-2*(1-x)+3 = 0
3-2*(1-x)-5/7*(x-3) = 0
3-2*(1-x)-5/7*(x-3) = 0
9/7*x+1/7+3 = 0
9/7*x+22/7 = 0
9/7*x+22/7 = 0
9/7*x+22/7 = 0 // - 22/7
9/7*x = -22/7 // : 9/7
x = -22/7/9/7
x = -22/9
x = -22/9
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