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x in (-oo:+oo)
1/2-((6/7)*x) = -11/2 // + -11/2
1/2-((6/7)*x)-(-11/2) = 0
(-6/7)*x+1/2+11/2 = 0
6-6/7*x = 0 // - 6
-6/7*x = -6 // : -6/7
x = -6/(-6/7)
x = 7
x = 7
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