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(2/7)*(4*x-18) = 12 // - 12
(2/7)*(4*x-18)-12 = 0
2/7*(4*x-18)-12 = 0
2/7*(4*x-18)-12 = 0
8/7*x-120/7 = 0
8/7*x-120/7 = 0
8/7*x-120/7 = 0 // + 120/7
8/7*x = 120/7 // : 8/7
x = 120/7/8/7
x = 15
x = 15
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