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x in (-oo:+oo)
(-4/5)*x = 11 // - 11
(-4/5)*x-11 = 0
-4/5*x-11 = 0 // + 11
-4/5*x = 11 // : -4/5
x = 11/(-4/5)
x = -55/4
x = -55/4
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