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x in (-oo:+oo)
-((3/4)*x) = 6/7 // - 6/7
-((3/4)*x)-(6/7) = 0
(-3/4)*x-6/7 = 0
-3/4*x-6/7 = 0 // + 6/7
-3/4*x = 6/7 // : -3/4
x = 6/7/(-3/4)
x = -8/7
x = -8/7
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