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a in (-oo:+oo)
43 = 3*a+3*a+7 // - 3*a+3*a+7
43-(3*a)-(3*a)-7 = 0
43-3*a-3*a-7 = 0
36-6*a = 0 // - 36
-6*a = -36 // : -6
a = -36/(-6)
a = 6
a = 6
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