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a in (-oo:+oo)
4*(a-4) = -56 // + 56
4*(a-4)+56 = 0
4*(a-4)+56 = 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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