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(4/5)*(x-10) = 4*(8-x) // - 4*(8-x)
(4/5)*(x-10)-(4*(8-x)) = 0
(4/5)*(x-10)-4*(8-x) = 0
4/5*(x-10)-4*(8-x) = 0
4/5*(x-10)-4*(8-x) = 0
24/5*x-40 = 0
24/5*x-40 = 0
24/5*x-40 = 0 // + 40
24/5*x = 40 // : 24/5
x = 40/24/5
x = 25/3
x = 25/3
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