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a in (-oo:+oo)
-7/45 = (4/5)*a-(3*a)+1/3 // - (4/5)*a-(3*a)+1/3
3*a-((4/5)*a)-7/45-(1/3) = 0
(-4/5)*a+3*a-7/45-1/3 = 0
11/5*a-22/45 = 0 // + 22/45
11/5*a = 22/45 // : 11/5
a = 22/45/11/5
a = 2/9
a = 2/9
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