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(3/5)*x-4 = 106/5-3*x // - 106/5-3*x
(3/5)*x-(-3*x)-(106/5)-4 = 0
(3/5)*x+3*x-106/5-4 = 0
18/5*x-126/5 = 0 // + 126/5
18/5*x = 126/5 // : 18/5
x = 126/5/18/5
x = 7
x = 7
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