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x in (-oo:+oo)
x/11-((4*x)/11) = 15 // - 15
x/11-((4*x)/11)-15 = 0
x/11+(-4/11)*x-15 = 0
-3/11*x-15 = 0 // + 15
-3/11*x = 15 // : -3/11
x = 15/(-3/11)
x = -55
x = -55
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