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a in (-oo:+oo)
0.5*a-3 = 7-((3/4)*a) // - 7-((3/4)*a)
0.5*a+(3/4)*a-7-3 = 0
1.25*a-10 = 0 // + 10
1.25*a = 10 // : 1.25
a = 10/1.25
a = 8
a = 8
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