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a in (-oo:+oo)
-49/45 = 2*a-4*a+1/9 // - 2*a-4*a+1/9
-(-4*a)-(2*a)-49/45-(1/9) = 0
4*a-2*a-49/45-1/9 = 0
2*a-6/5 = 0 // + 6/5
2*a = 6/5 // : 2
a = 6/5/2
a = 3/5
a = 3/5
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