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a in (-oo:+oo)
(7/10)*a = (1/10)*a+4/5 // - (1/10)*a+4/5
(7/10)*a-((1/10)*a)-(4/5) = 0
(7/10)*a+(-1/10)*a-4/5 = 0
3/5*a-4/5 = 0 // + 4/5
3/5*a = 4/5 // : 3/5
a = 4/5/3/5
a = 4/3
a = 4/3
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