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x in (-oo:+oo)
(2/7)*x+4 = (16/7)*x // - (16/7)*x
(2/7)*x-((16/7)*x)+4 = 0
(2/7)*x+(-16/7)*x+4 = 0
4-2*x = 0 // - 4
-2*x = -4 // : -2
x = -4/(-2)
x = 2
x = 2
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