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a in (-oo:+oo)
1/10-3*a = (1/5)*a-27/50 // - (1/5)*a-27/50
1/10-3*a-((1/5)*a)-(-27/50) = 0
(-1/5)*a-3*a+1/10+27/50 = 0
16/25-16/5*a = 0 // - 16/25
-16/5*a = -16/25 // : -16/5
a = -16/25/(-16/5)
a = 1/5
a = 1/5
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