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a in (-oo:+oo)
4*a-(2*a)-4 = 4 // - 4
4*a-(2*a)-4-4 = 0
4*a-2*a-4-4 = 0
2*a-8 = 0 // + 8
2*a = 8 // : 2
a = 8/2
a = 4
a = 4
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