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(4/5)*(x-1) = x/2+1 // - x/2+1
(4/5)*(x-1)-(x/2)-1 = 0
4/5*(x-1)-x/2-1 = 0
(4/5*2*(x-1))/2-x/2+(-1*2)/2 = 0
4/5*2*(x-1)-x-1*2 = 0
3/5*x-2-8/5 = 0
3/5*x-18/5 = 0
(3/5*x-18/5)/2 = 0
(3/5*x-18/5)/2 = 0 // * 2
3/5*x-18/5 = 0
3/5*x-18/5 = 0 // + 18/5
3/5*x = 18/5 // : 3/5
x = 18/5/3/5
x = 6
x = 6
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