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a in (-oo:+oo)
-8 = (-1/4)*a // - (-1/4)*a
-((-1/4)*a)-8 = 0
(1/4)*a-8 = 0
1/4*a-8 = 0 // + 8
1/4*a = 8 // : 1/4
a = 8/1/4
a = 32
a = 32
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