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a in (-oo:+oo)
a/12-(8/12) = (2*a)/3+5/3 // - (2*a)/3+5/3
a/12-((2*a)/3)-(8/12)-(5/3) = 0
a/12+(-2/3)*a-2/3-5/3 = 0
-7/12*a-7/3 = 0 // + 7/3
-7/12*a = 7/3 // : -7/12
a = 7/3/(-7/12)
a = -4
a = -4
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