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a in (-oo:+oo)
-11 = a/5+18 // - a/5+18
-(a/5)-18-11 = 0
-1/5*a-29 = 0 // + 29
-1/5*a = 29 // : -1/5
a = 29/(-1/5)
a = -145
a = -145
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