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a in (-oo:+oo)
59 = 2*a+4*a-1 // - 2*a+4*a-1
1-(2*a)-(4*a)+59 = 0
1-2*a-4*a+59 = 0
60-6*a = 0 // - 60
-6*a = -60 // : -6
a = -60/(-6)
a = 10
a = 10
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