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(3*x-12)/5+x/20 = x/4-2 // - x/4-2
(3*x-12)/5+x/20-(x/4)+2 = 0
(3*x-12)/5+x/20-x/4+2 = 0
(4*20*(3*x-12))/(4*5*20)+(4*5*x)/(4*5*20)+(5*20*(-x))/(4*5*20)+(2*4*5*20)/(4*5*20) = 0
4*20*(3*x-12)+4*5*x+5*20*(-x)+2*4*5*20 = 0
260*x-100*x-960+800 = 0
160*x-960+800 = 0
160*x-160 = 0
(160*x-160)/(4*5*20) = 0
(160*x-160)/(4*5*20) = 0 // * 4*5*20
160*x-160 = 0
160*x-160 = 0 // + 160
160*x = 160 // : 160
x = 160/160
x = 1
x = 1
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