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a in (-oo:+oo)
(5/8)*a = (1/8)*a+3/4 // - (1/8)*a+3/4
(5/8)*a-((1/8)*a)-(3/4) = 0
(5/8)*a+(-1/8)*a-3/4 = 0
1/2*a-3/4 = 0 // + 3/4
1/2*a = 3/4 // : 1/2
a = 3/4/1/2
a = 3/2
a = 3/2
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