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x in (-oo:+oo)
21 = (14/15)*x // - (14/15)*x
21-((14/15)*x) = 0
(-14/15)*x+21 = 0
21-14/15*x = 0 // - 21
-14/15*x = -21 // : -14/15
x = -21/(-14/15)
x = 45/2
x = 45/2
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