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x in (-oo:+oo)
(1/4)*x = 7/40 // - 7/40
(1/4)*x-(7/40) = 0
(1/4)*x-7/40 = 0
1/4*x-7/40 = 0 // + 7/40
1/4*x = 7/40 // : 1/4
x = 7/40/1/4
x = 7/10
x = 7/10
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