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(3/5)*(5*x+10) = (5/6)*(12*x-18) // - (5/6)*(12*x-18)
(3/5)*(5*x+10)-((5/6)*(12*x-18)) = 0
(3/5)*(5*x+10)+(-5/6)*(12*x-18) = 0
3/5*(5*x+10)-5/6*(12*x-18) = 0
3/5*(5*x+10)-5/6*(12*x-18) = 0
21-7*x = 0
21-7*x = 0
21-7*x = 0 // - 21
-7*x = -21 // : -7
x = -21/(-7)
x = 3
x = 3
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