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(4*(x-1))/10 = (2*(x+4))/10 // - (2*(x+4))/10
(4*(x-1))/10-((2*(x+4))/10) = 0
(4*(x-1))/10+(-1/5)*(x+4) = 0
(4*(x-1))/10-1/5*(x+4) = 0
(4*(x-1))/10+(-1/5*10*(x+4))/10 = 0
4*(x-1)-1/5*10*(x+4) = 0
2*x-12 = 0
(2*x-12)/10 = 0
(2*x-12)/10 = 0 // * 10
2*x-12 = 0
2*x-12 = 0 // + 12
2*x = 12 // : 2
x = 12/2
x = 6
x = 6
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