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a in (-oo:+oo)
46 = 5*a+7*a+10 // - 5*a+7*a+10
46-(5*a)-(7*a)-10 = 0
46-5*a-7*a-10 = 0
36-12*a = 0 // - 36
-12*a = -36 // : -12
a = -36/(-12)
a = 3
a = 3
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