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x in (-oo:+oo)
-18 = x/(-2)-7 // - x/(-2)-7
7-(x/(-2))-18 = 0
1/2*x-11 = 0 // + 11
1/2*x = 11 // : 1/2
x = 11/1/2
x = 22
x = 22
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