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a in (-oo:+oo)
(1/10)*(a+2) = (1/4)*(2-a) // - (1/4)*(2-a)
(1/10)*(a+2)-((1/4)*(2-a)) = 0
(1/10)*(a+2)+(-1/4)*(2-a) = 0
1/10*(a+2)-1/4*(2-a) = 0
1/10*(a+2)-1/4*(2-a) = 0
7/20*a-3/10 = 0
7/20*a-3/10 = 0
7/20*a-3/10 = 0 // + 3/10
7/20*a = 3/10 // : 7/20
a = 3/10/7/20
a = 6/7
a = 6/7
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