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(1/5)*(15*x-30) = (1/2)*(12*x-6) // - (1/2)*(12*x-6)
(1/5)*(15*x-30)-((1/2)*(12*x-6)) = 0
(1/5)*(15*x-30)+(-1/2)*(12*x-6) = 0
1/5*(15*x-30)-1/2*(12*x-6) = 0
1/5*(15*x-30)-1/2*(12*x-6) = 0
-3*x-3 = 0
-3*x-3 = 0
-3*x-3 = 0 // + 3
-3*x = 3 // : -3
x = 3/(-3)
x = -1
x = -1
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