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(2/4)*x+7 = (4/5)*x // - (4/5)*x
(2/4)*x-((4/5)*x)+7 = 0
(2/4)*x+(-4/5)*x+7 = 0
7-3/10*x = 0 // - 7
-3/10*x = -7 // : -3/10
x = -7/(-3/10)
x = 70/3
x = 70/3
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