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a in (-oo:+oo)
10 = (1/4)*a // - (1/4)*a
10-((1/4)*a) = 0
(-1/4)*a+10 = 0
10-1/4*a = 0 // - 10
-1/4*a = -10 // : -1/4
a = -10/(-1/4)
a = 40
a = 40
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