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(1/3)*(18*x+15) = (1/4)*(4*x+12) // - (1/4)*(4*x+12)
(1/3)*(18*x+15)-((1/4)*(4*x+12)) = 0
(1/3)*(18*x+15)+(-1/4)*(4*x+12) = 0
1/3*(18*x+15)-1/4*(4*x+12) = 0
1/3*(18*x+15)-1/4*(4*x+12) = 0
5*x+2 = 0
5*x+2 = 0
5*x+2 = 0 // - 2
5*x = -2 // : 5
x = -2/5
x = -2/5
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