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a in (-oo:+oo)
5*(-1*a-1) = 55 // - 55
5*(-1*a-1)-55 = 0
5*(-a-1)-55 = 0
5*(-a-1)-55 = 0
-5*a-60 = 0
-5*a-60 = 0
-5*a-60 = 0 // + 60
-5*a = 60 // : -5
a = 60/(-5)
a = -12
a = -12
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