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a in (-oo:+oo)
(1/8)*(a+3) = (1/4)*(9-a) // - (1/4)*(9-a)
(1/8)*(a+3)-((1/4)*(9-a)) = 0
(1/8)*(a+3)+(-1/4)*(9-a) = 0
1/8*(a+3)-1/4*(9-a) = 0
1/8*(a+3)-1/4*(9-a) = 0
3/8*a-15/8 = 0
3/8*a-15/8 = 0
3/8*a-15/8 = 0 // + 15/8
3/8*a = 15/8 // : 3/8
a = 15/8/3/8
a = 5
a = 5
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