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a in (-oo:+oo)
(1/4)*(a+1) = (1/10)*(5-a) // - (1/10)*(5-a)
(1/4)*(a+1)-((1/10)*(5-a)) = 0
(1/4)*(a+1)+(-1/10)*(5-a) = 0
1/4*(a+1)-1/10*(5-a) = 0
1/4*(a+1)-1/10*(5-a) = 0
7/20*a-1/4 = 0
7/20*a-1/4 = 0
7/20*a-1/4 = 0 // + 1/4
7/20*a = 1/4 // : 7/20
a = 1/4/7/20
a = 5/7
a = 5/7
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