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a in (-oo:+oo)
4*a-(7*a)+1 = -5 // + 5
4*a-(7*a)+1+5 = 0
4*a-7*a+1+5 = 0
6-3*a = 0 // - 6
-3*a = -6 // : -3
a = -6/(-3)
a = 2
a = 2
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