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a in (-oo:+oo)
(1/2)*a+6*a+9/10 = -383/80 // + -383/80
(1/2)*a+6*a+9/10-(-383/80) = 0
(1/2)*a+6*a+9/10+383/80 = 0
13/2*a+91/16 = 0 // - 91/16
13/2*a = -91/16 // : 13/2
a = -91/16/13/2
a = -7/8
a = -7/8
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