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(4/5)*x-((6/7)*x) = 61/30 // - 61/30
(4/5)*x-((6/7)*x)-(61/30) = 0
(4/5)*x+(-6/7)*x-61/30 = 0
-2/35*x-61/30 = 0 // + 61/30
-2/35*x = 61/30 // : -2/35
x = 61/30/(-2/35)
x = -427/12
x = -427/12
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