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(1/6)*(5*x+7) = 7*x // - 7*x
(1/6)*(5*x+7)-(7*x) = 0
(1/6)*(5*x+7)-7*x = 0
1/6*(5*x+7)-7*x = 0
1/6*(5*x+7)-7*x = 0
7/6-37/6*x = 0
7/6-37/6*x = 0
7/6-37/6*x = 0 // - 7/6
-37/6*x = -7/6 // : -37/6
x = -7/6/(-37/6)
x = 7/37
x = 7/37
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