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a in (-oo:+oo)
8*a-((1/2)*(6*a-14)) = 0
(-1/2)*(6*a-14)+8*a = 0
8*a-1/2*(6*a-14) = 0
8*a-1/2*(6*a-14) = 0
5*a+7 = 0
5*a+7 = 0
5*a+7 = 0 // - 7
5*a = -7 // : 5
a = -7/5
a = -7/5
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