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a in (-oo:+oo)
(1/5)*(a+39) = 5 // - 5
(1/5)*(a+39)-5 = 0
1/5*(a+39)-5 = 0
1/5*(a+39)-5 = 0
1/5*a+14/5 = 0
1/5*a+14/5 = 0
1/5*a+14/5 = 0 // - 14/5
1/5*a = -14/5 // : 1/5
a = -14/5/1/5
a = -14
a = -14
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