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x in (-oo:+oo)
7-((1/2)*x) = 22 // - 22
7-((1/2)*x)-22 = 0
(-1/2)*x-22+7 = 0
-1/2*x-15 = 0 // + 15
-1/2*x = 15 // : -1/2
x = 15/(-1/2)
x = -30
x = -30
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