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a in (-oo:+oo)
2*a-(4*a)+4 = -6 // + 6
2*a-(4*a)+4+6 = 0
2*a-4*a+4+6 = 0
10-2*a = 0 // - 10
-2*a = -10 // : -2
a = -10/(-2)
a = 5
a = 5
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