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x in (-oo:+oo)
6-((3/7)*x) = 11 // - 11
6-((3/7)*x)-11 = 0
(-3/7)*x-11+6 = 0
-3/7*x-5 = 0 // + 5
-3/7*x = 5 // : -3/7
x = 5/(-3/7)
x = -35/3
x = -35/3
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