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x in (-oo:+oo)
(2/5)*x-(1/10) = (3/4)*x // - (3/4)*x
(2/5)*x-((3/4)*x)-(1/10) = 0
(2/5)*x+(-3/4)*x-1/10 = 0
-7/20*x-1/10 = 0 // + 1/10
-7/20*x = 1/10 // : -7/20
x = 1/10/(-7/20)
x = -2/7
x = -2/7
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