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a in (-oo:+oo)
9/15-3*a-(2*a)-a-(5/5)+2/10 = 0
9/15-3*a-2*a-a+2/10-1 = 0
-6*a-1/5 = 0 // + 1/5
-6*a = 1/5 // : -6
a = 1/5/(-6)
a = -1/30
a = -1/30
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