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a in (-oo:+oo)
(5/8)*a = (3/4)*a+6 // - (3/4)*a+6
(5/8)*a-((3/4)*a)-6 = 0
(5/8)*a+(-3/4)*a-6 = 0
-1/8*a-6 = 0 // + 6
-1/8*a = 6 // : -1/8
a = 6/(-1/8)
a = -48
a = -48
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