2d-4=20

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Solution for 2d-4=20 equation: 


d in (-oo:+oo)

2*d-4 = 20 // - 20

2*d-20-4 = 0

2*d-24 = 0 // + 24

2*d = 24 // : 2

d = 24/2

d = 12

d = 12

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