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