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a in (-oo:+oo)
7*a+1 = 3*a-43 // - 3*a-43
7*a-(3*a)+1+43 = 0
7*a-3*a+1+43 = 0
4*a+44 = 0 // - 44
4*a = -44 // : 4
a = -44/4
a = -11
a = -11
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