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a in (-oo:+oo)
4*(a+4) = 52 // - 52
4*(a+4)-52 = 0
4*(a+4)-52 = 0
4*a-36 = 0
4*a-36 = 0
4*a-36 = 0 // + 36
4*a = 36 // : 4
a = 36/4
a = 9
a = 9
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