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x in (-oo:+oo)
(1/4)*x = 20/400 // - 20/400
(1/4)*x-(20/400) = 0
(1/4)*x-1/20 = 0
1/4*x-1/20 = 0 // + 1/20
1/4*x = 1/20 // : 1/4
x = 1/20/1/4
x = 1/5
x = 1/5
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