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x in (-oo:+oo)
-7*x = -42/11 // + -42/11
-7*x-(-42/11) = 0
42/11-7*x = 0
42/11-7*x = 0 // - 42/11
-7*x = -42/11 // : -7
x = -42/11/(-7)
x = 6/11
x = 6/11
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