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a in (-oo:+oo)
a/4-(2/3) = (5*a)/12 // - (5*a)/12
a/4-((5*a)/12)-(2/3) = 0
a/4+(-5/12)*a-2/3 = 0
-1/6*a-2/3 = 0 // + 2/3
-1/6*a = 2/3 // : -1/6
a = 2/3/(-1/6)
a = -4
a = -4
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