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2.5 = (x-4)/4 // - (x-4)/4
2.5-((x-4)/4) = 0
(-1*(x-4))/4+2.5 = 0
(-1*(x-4))/4+(2.5*4)/4 = 0
2.5*4-1*(x-4) = 0
14-x = 0
(14-x)/4 = 0
(14-x)/4 = 0 // * 4
14-x = 0
14-x = 0 // - 14
-x = -14 // * -1
x = 14
x = 14
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