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a in (-oo:+oo)
(1/2)*a-3 = 7-((3/4)*a) // - 7-((3/4)*a)
(1/2)*a+(3/4)*a-7-3 = 0
5/4*a-10 = 0 // + 10
5/4*a = 10 // : 5/4
a = 10/5/4
a = 8
a = 8
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