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(1/4)*x-((1/5)*x) = 2 // - 2
(1/4)*x-((1/5)*x)-2 = 0
(1/4)*x+(-1/5)*x-2 = 0
1/20*x-2 = 0 // + 2
1/20*x = 2 // : 1/20
x = 2/1/20
x = 40
x = 40
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