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x in (-oo:+oo)
(-11/4)*x = 7 // - 7
(-11/4)*x-7 = 0
-11/4*x-7 = 0 // + 7
-11/4*x = 7 // : -11/4
x = 7/(-11/4)
x = -28/11
x = -28/11
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