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x in (-oo:+oo)
(1/4)*x-40 = 2*x-5 // - 2*x-5
(1/4)*x-(2*x)-40+5 = 0
(1/4)*x-2*x-40+5 = 0
-7/4*x-35 = 0 // + 35
-7/4*x = 35 // : -7/4
x = 35/(-7/4)
x = -20
x = -20
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