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(2*x+10)/4 = 12 // - 12
(2*x+10)/4-12 = 0
(2*x+10)/4+(-12*4)/4 = 0
2*x-12*4+10 = 0
2*x-38 = 0
(2*x-38)/4 = 0
(2*x-38)/4 = 0 // * 4
2*x-38 = 0
2*x-38 = 0 // + 38
2*x = 38 // : 2
x = 38/2
x = 19
x = 19
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