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a in (-oo:+oo)
54 = 4*a+3*a-2 // - 4*a+3*a-2
2-(4*a)-(3*a)+54 = 0
2-4*a-3*a+54 = 0
56-7*a = 0 // - 56
-7*a = -56 // : -7
a = -56/(-7)
a = 8
a = 8
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