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1.5 = (x-20)/4 // - (x-20)/4
1.5-((x-20)/4) = 0
(-1*(x-20))/4+1.5 = 0
(-1*(x-20))/4+(1.5*4)/4 = 0
1.5*4-1*(x-20) = 0
26-x = 0
(26-x)/4 = 0
(26-x)/4 = 0 // * 4
26-x = 0
26-x = 0 // - 26
-x = -26 // * -1
x = 26
x = 26
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