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a in (-oo:+oo)
(1/2)*a+3/4 = 15/4 // - 15/4
(1/2)*a+3/4-(15/4) = 0
(1/2)*a+3/4-15/4 = 0
1/2*a-3 = 0 // + 3
1/2*a = 3 // : 1/2
a = 3/1/2
a = 6
a = 6
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