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a in (-oo:+oo)
4*(1*a+4) = 36 // - 36
4*(1*a+4)-36 = 0
4*(a+4)-36 = 0
4*(a+4)-36 = 0
4*a-20 = 0
4*a-20 = 0
4*a-20 = 0 // + 20
4*a = 20 // : 4
a = 20/4
a = 5
a = 5
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