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(5/7)*x-((1/4)*x)+10 = (9/14)*x // - (9/14)*x
(5/7)*x-((1/4)*x)-((9/14)*x)+10 = 0
(5/7)*x+(-1/4)*x+(-9/14)*x+10 = 0
10-5/28*x = 0 // - 10
-5/28*x = -10 // : -5/28
x = -10/(-5/28)
x = 56
x = 56
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