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(2.5*(x-4.2))/5-4.3 = 5-4 // - 5-4
(2.5*(x-4.2))/5-5-4.3+4 = 0
(2.5*(x-4.2))/5+(-5*5)/5+(-4.3*5)/5+(4*5)/5 = 0
2.5*(x-4.2)-5*5-4.3*5+4*5 = 0
2.5*x-35.5-21.5+20 = 0
2.5*x-57+20 = 0
2.5*x-37 = 0
(2.5*x-37)/5 = 0
(2.5*x-37)/5 = 0 // * 5
2.5*x-37 = 0
2.5*x-37 = 0 // + 37
2.5*x = 37 // : 2.5
x = 37/2.5
x = 14.8
x = 14.8
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