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x+(4/5)*x-4 = 34/5 // - 34/5
x+(4/5)*x-(34/5)-4 = 0
x+(4/5)*x-34/5-4 = 0
9/5*x-54/5 = 0 // + 54/5
9/5*x = 54/5 // : 9/5
x = 54/5/9/5
x = 6
x = 6
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