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x in (-oo:+oo)
(2*x)/40 = 12/40 // - 12/40
(2*x)/40-(12/40) = 0
(2*x)/40-3/10 = 0
1/20*x-3/10 = 0 // + 3/10
1/20*x = 3/10 // : 1/20
x = 3/10/1/20
x = 6
x = 6
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