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(1/3)*(9*x-15) = (1/5)*(25*x-15) // - (1/5)*(25*x-15)
(1/3)*(9*x-15)-((1/5)*(25*x-15)) = 0
(1/3)*(9*x-15)+(-1/5)*(25*x-15) = 0
1/3*(9*x-15)-1/5*(25*x-15) = 0
1/3*(9*x-15)-1/5*(25*x-15) = 0
-2*x-2 = 0
-2*x-2 = 0
-2*x-2 = 0 // + 2
-2*x = 2 // : -2
x = 2/(-2)
x = -1
x = -1
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