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a in (-oo:+oo)
2*(4-2*a) = 48 // - 48
2*(4-2*a)-48 = 0
2*(4-2*a)-48 = 0
-4*a-40 = 0
-4*a-40 = 0
-4*a-40 = 0 // + 40
-4*a = 40 // : -4
a = 40/(-4)
a = -10
a = -10
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