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a in (-oo:+oo)
(2/3)*a-5 = (3/4)*a // - (3/4)*a
(2/3)*a-((3/4)*a)-5 = 0
(2/3)*a+(-3/4)*a-5 = 0
-1/12*a-5 = 0 // + 5
-1/12*a = 5 // : -1/12
a = 5/(-1/12)
a = -60
a = -60
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