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a in (-oo:+oo)
a/4-((2*a)/3) = -15/2 // + -15/2
a/4-((2*a)/3)-(-15/2) = 0
a/4+(-2/3)*a+15/2 = 0
15/2-5/12*a = 0 // - 15/2
-5/12*a = -15/2 // : -5/12
a = -15/2/(-5/12)
a = 18
a = 18
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