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a in (-oo:+oo)
a/2+2/5 = (5*a)/6+6/7 // - (5*a)/6+6/7
a/2-((5*a)/6)+2/5-(6/7) = 0
a/2+(-5/6)*a+2/5-6/7 = 0
-1/3*a-16/35 = 0 // + 16/35
-1/3*a = 16/35 // : -1/3
a = 16/35/(-1/3)
a = -48/35
a = -48/35
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