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x in (-oo:+oo)
(6*x)/(-5) = 42 // - 42
(6*x)/(-5)-42 = 0
-6/5*x-42 = 0 // + 42
-6/5*x = 42 // : -6/5
x = 42/(-6/5)
x = -35
x = -35
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