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(2*x)/7-(1/4) = (3*x)/8+1/5 // - (3*x)/8+1/5
(2*x)/7-((3*x)/8)-(1/4)-(1/5) = 0
(2*x)/7+(-3/8)*x-1/4-1/5 = 0
-5/56*x-9/20 = 0 // + 9/20
-5/56*x = 9/20 // : -5/56
x = 9/20/(-5/56)
x = -126/25
x = -126/25
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