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(x+15)/3 = 18-4*x // - 18-4*x
(x+15)/3-(-4*x)-18 = 0
(x+15)/3+4*x-18 = 0
(x+15)/3+(3*4*x)/3+(-18*3)/3 = 0
x+3*4*x-18*3+15 = 0
13*x-54+15 = 0
13*x-39 = 0
(13*x-39)/3 = 0
(13*x-39)/3 = 0 // * 3
13*x-39 = 0
13*x-39 = 0 // + 39
13*x = 39 // : 13
x = 39/13
x = 3
x = 3
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