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A in (-oo:+oo)
A/2-(7/8) = -3/8 // + -3/8
A/2-(7/8)-(-3/8) = 0
A/2-7/8+3/8 = 0
1/2*A-1/2 = 0 // + 1/2
1/2*A = 1/2 // : 1/2
A = 1/2/1/2
A = 1
A = 1
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