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x in (-oo:+oo)
(-5/6)*x = 7 // - 7
(-5/6)*x-7 = 0
-5/6*x-7 = 0 // + 7
-5/6*x = 7 // : -5/6
x = 7/(-5/6)
x = -42/5
x = -42/5
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