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(3/4)*x-4 = 1/5 // - 1/5
(3/4)*x-(1/5)-4 = 0
(3/4)*x-1/5-4 = 0
3/4*x-21/5 = 0 // + 21/5
3/4*x = 21/5 // : 3/4
x = 21/5/3/4
x = 28/5
x = 28/5
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