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a in (-oo:+oo)
a/5-a+2/10 = 3/10 // - 3/10
a/5-a+2/10-(3/10) = 0
a/5-a+2/10-3/10 = 0
-4/5*a-1/10 = 0 // + 1/10
-4/5*a = 1/10 // : -4/5
a = 1/10/(-4/5)
a = -1/8
a = -1/8
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