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x in (-oo:+oo)
1/2-((6/7)*x) = 17/14 // - 17/14
1/2-((6/7)*x)-(17/14) = 0
(-6/7)*x+1/2-17/14 = 0
-6/7*x-5/7 = 0 // + 5/7
-6/7*x = 5/7 // : -6/7
x = 5/7/(-6/7)
x = -5/6
x = -5/6
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