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a in (-oo:+oo)
79/8 = (-3/4)*a+a+10 // - (-3/4)*a+a+10
79/8-((-3/4)*a)-a-10 = 0
(3/4)*a-a+79/8-10 = 0
-1/4*a-1/8 = 0 // + 1/8
-1/4*a = 1/8 // : -1/4
a = 1/8/(-1/4)
a = -1/2
a = -1/2
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