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(4/5)*x+3 = 47/5 // - 47/5
(4/5)*x-(47/5)+3 = 0
(4/5)*x-47/5+3 = 0
4/5*x-32/5 = 0 // + 32/5
4/5*x = 32/5 // : 4/5
x = 32/5/4/5
x = 8
x = 8
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