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(4/5)*x+2/3 = 10 // - 10
(4/5)*x+2/3-10 = 0
4/5*x-28/3 = 0 // + 28/3
4/5*x = 28/3 // : 4/5
x = 28/3/4/5
x = 35/3
x = 35/3
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