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