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