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a in (-oo:+oo)
60 = 4*a+2*a+6 // - 4*a+2*a+6
60-(4*a)-(2*a)-6 = 0
60-4*a-2*a-6 = 0
54-6*a = 0 // - 54
-6*a = -54 // : -6
a = -54/(-6)
a = 9
a = 9
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