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a in (-oo:+oo)
(1/4)*a-12 = (5/4)*a+6 // - (5/4)*a+6
(1/4)*a-((5/4)*a)-12-6 = 0
(1/4)*a+(-5/4)*a-12-6 = 0
-a-18 = 0 // + 18
-a = 18 // * -1
a = -18
a = -18
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