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x in (-oo:+oo)
-7*x = -49/11 // + -49/11
-7*x-(-49/11) = 0
49/11-7*x = 0
49/11-7*x = 0 // - 49/11
-7*x = -49/11 // : -7
x = -49/11/(-7)
x = 7/11
x = 7/11
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