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(30*x-3)/15 = -2 // + 2
(30*x-3)/15+2 = 0
(30*x-3)/15+(2*15)/15 = 0
30*x+2*15-3 = 0
30*x+27 = 0
(30*x+27)/15 = 0
(30*x+27)/15 = 0 // * 15
30*x+27 = 0
30*x+27 = 0 // - 27
30*x = -27 // : 30
x = -27/30
x = -9/10
x = -9/10
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