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x in (-oo:+oo)
168 = (7/11)*x // - (7/11)*x
168-((7/11)*x) = 0
(-7/11)*x+168 = 0
168-7/11*x = 0 // - 168
-7/11*x = -168 // : -7/11
x = -168/(-7/11)
x = 264
x = 264
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