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a in (-oo:+oo)
1-(4*a) = 4-3*a // - 4-3*a
1-(4*a)-(-3*a)-4 = 0
3*a-4*a-4+1 = 0
-a-3 = 0 // + 3
-a = 3 // * -1
a = -3
a = -3
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