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1.4*(x-12) = 3/4 // - 3/4
1.4*(x-12)-(3/4) = 0
1.4*(x-12)-3/4 = 0
(1.4*4*(x-12))/4-3/4 = 0
1.4*4*(x-12)-3 = 0
5.6*x-70.2 = 0
(5.6*x-70.2)/4 = 0
(5.6*x-70.2)/4 = 0 // * 4
5.6*x-70.2 = 0
5.6*x-70.2 = 0 // + 70.2
5.6*x = 70.2 // : 5.6
x = 70.2/5.6
x = 12.53571429
x = 12.53571429
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