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(3/4)*x-4 = (1/5)*x // - (1/5)*x
(3/4)*x-((1/5)*x)-4 = 0
(3/4)*x+(-1/5)*x-4 = 0
11/20*x-4 = 0 // + 4
11/20*x = 4 // : 11/20
x = 4/11/20
x = 80/11
x = 80/11
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