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x in (-oo:+oo)
-20 = (4/11)*x // - (4/11)*x
-((4/11)*x)-20 = 0
(-4/11)*x-20 = 0
-4/11*x-20 = 0 // + 20
-4/11*x = 20 // : -4/11
x = 20/(-4/11)
x = -55
x = -55
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