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(48-12*x)/4-18 = -30 // + 30
(48-12*x)/4-18+30 = 0
(48-12*x)/4+(-18*4)/4+(4*30)/4 = 0
4*30-12*x-18*4+48 = 0
120-12*x-24 = 0
96-12*x = 0
(96-12*x)/4 = 0
(96-12*x)/4 = 0 // * 4
96-12*x = 0
96-12*x = 0 // - 96
-12*x = -96 // : -12
x = -96/(-12)
x = 8
x = 8
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