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x in (-oo:+oo)
(-6/17)*x = 20 // - 20
(-6/17)*x-20 = 0
-6/17*x-20 = 0 // + 20
-6/17*x = 20 // : -6/17
x = 20/(-6/17)
x = -170/3
x = -170/3
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