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a in (-oo:+oo)
2*a-(3/10) = (-4/5)*a+221/10 // - (-4/5)*a+221/10
2*a-((-4/5)*a)-(3/10)-(221/10) = 0
2*a+(4/5)*a-3/10-221/10 = 0
14/5*a-112/5 = 0 // + 112/5
14/5*a = 112/5 // : 14/5
a = 112/5/14/5
a = 8
a = 8
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