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x in (-oo:+oo)
(1/2)*x = (9/14)*x+2/7 // - (9/14)*x+2/7
(1/2)*x-((9/14)*x)-(2/7) = 0
(1/2)*x+(-9/14)*x-2/7 = 0
-1/7*x-2/7 = 0 // + 2/7
-1/7*x = 2/7 // : -1/7
x = 2/7/(-1/7)
x = -2
x = -2
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