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x in (-oo:+oo)
(1/4)*x-((2/5)*x) = 39 // - 39
(1/4)*x-((2/5)*x)-39 = 0
(1/4)*x+(-2/5)*x-39 = 0
-3/20*x-39 = 0 // + 39
-3/20*x = 39 // : -3/20
x = 39/(-3/20)
x = -260
x = -260
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