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