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a in (-oo:+oo)
(-1/5)*(a+3) = -4 // + 4
(-1/5)*(a+3)+4 = 0
4-1/5*(a+3) = 0
4-1/5*(a+3) = 0
17/5-1/5*a = 0
17/5-1/5*a = 0
17/5-1/5*a = 0 // - 17/5
-1/5*a = -17/5 // : -1/5
a = -17/5/(-1/5)
a = 17
a = 17
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