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x in (-oo:+oo)
(1/2)*x-((1/9)*x) = 21 // - 21
(1/2)*x-((1/9)*x)-21 = 0
(1/2)*x+(-1/9)*x-21 = 0
7/18*x-21 = 0 // + 21
7/18*x = 21 // : 7/18
x = 21/7/18
x = 54
x = 54
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