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(1/4)*x-((1/5)*x)+(1/20)*x = 4 // - 4
(1/4)*x-((1/5)*x)+(1/20)*x-4 = 0
(1/4)*x+(-1/5)*x+(1/20)*x-4 = 0
1/10*x-4 = 0 // + 4
1/10*x = 4 // : 1/10
x = 4/1/10
x = 40
x = 40
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