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(5/7)*x-3 = (3/4)*x-5 // - (3/4)*x-5
(5/7)*x-((3/4)*x)-3+5 = 0
(5/7)*x+(-3/4)*x-3+5 = 0
2-1/28*x = 0 // - 2
-1/28*x = -2 // : -1/28
x = -2/(-1/28)
x = 56
x = 56
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