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(4/5)*(5*x-45) = 2*(x-8) // - 2*(x-8)
(4/5)*(5*x-45)-(2*(x-8)) = 0
(4/5)*(5*x-45)-2*(x-8) = 0
4/5*(5*x-45)-2*(x-8) = 0
4/5*(5*x-45)-2*(x-8) = 0
2*x-20 = 0
2*x-20 = 0
2*x-20 = 0 // + 20
2*x = 20 // : 2
x = 20/2
x = 10
x = 10
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