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a in (-oo:+oo)
2*a+5/8 = -91/8 // + -91/8
2*a+5/8-(-91/8) = 0
2*a+5/8+91/8 = 0
2*a+12 = 0 // - 12
2*a = -12 // : 2
a = -12/2
a = -6
a = -6
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