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(2*x+6)/2 = 18 // - 18
(2*x+6)/2-18 = 0
(2*x+6)/2+(-18*2)/2 = 0
2*x-18*2+6 = 0
2*x-30 = 0
(2*x-30)/2 = 0
(2*x-30)/2 = 0 // * 2
2*x-30 = 0
2*x-30 = 0 // + 30
2*x = 30 // : 2
x = 30/2
x = 15
x = 15
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