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a in (-oo:+oo)
3/8-((1/4)*a) = -9/8 // + -9/8
3/8-((1/4)*a)-(-9/8) = 0
(-1/4)*a+3/8+9/8 = 0
3/2-1/4*a = 0 // - 3/2
-1/4*a = -3/2 // : -1/4
a = -3/2/(-1/4)
a = 6
a = 6
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