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(2*x-4)/10 = (2*x)/20 // - (2*x)/20
(2*x-4)/10-((2*x)/20) = 0
(2*x-4)/10+(-1/10)*x = 0
(2*x-4)/10-x/10 = 0
2*x-x-4 = 0
x-4 = 0
(x-4)/10 = 0
(x-4)/10 = 0 // * 10
x-4 = 0
x-4 = 0 // + 4
x = 4
x = 4
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