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(10/7)*x-4 = (5/4)*x // - (5/4)*x
(10/7)*x-((5/4)*x)-4 = 0
(10/7)*x+(-5/4)*x-4 = 0
5/28*x-4 = 0 // + 4
5/28*x = 4 // : 5/28
x = 4/5/28
x = 112/5
x = 112/5
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