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x in (-oo:+oo)
(-11/18)*x = 7 // - 7
(-11/18)*x-7 = 0
-11/18*x-7 = 0 // + 7
-11/18*x = 7 // : -11/18
x = 7/(-11/18)
x = -126/11
x = -126/11
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