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x in (-oo:+oo)
x/17-((7*x)/17) = 30/17 // - 30/17
x/17-((7*x)/17)-(30/17) = 0
x/17+(-7/17)*x-30/17 = 0
-6/17*x-30/17 = 0 // + 30/17
-6/17*x = 30/17 // : -6/17
x = 30/17/(-6/17)
x = -5
x = -5
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