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(4*(x-1))/6 = (2*(x+1))/5 // - (2*(x+1))/5
(4*(x-1))/6-((2*(x+1))/5) = 0
(4*(x-1))/6+(-2/5)*(x+1) = 0
(4*(x-1))/6-2/5*(x+1) = 0
(4*(x-1))/6+(-2/5*6*(x+1))/6 = 0
4*(x-1)-2/5*6*(x+1) = 0
8/5*x-32/5 = 0
(8/5*x-32/5)/6 = 0
(8/5*x-32/5)/6 = 0 // * 6
8/5*x-32/5 = 0
8/5*x-32/5 = 0 // + 32/5
8/5*x = 32/5 // : 8/5
x = 32/5/8/5
x = 4
x = 4
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