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a in (-oo:+oo)
(-1/5)*a+7 = -11 // + 11
(-1/5)*a+7+11 = 0
18-1/5*a = 0 // - 18
-1/5*a = -18 // : -1/5
a = -18/(-1/5)
a = 90
a = 90
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