d/2+20-13=42 - solution

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Solution for d/2+20-13=42 equation:

d in (-oo:+oo)

d/2-13+20 = 42 // - 42

d/2-42-13+20 = 0

1/2*d-35 = 0 // + 35

1/2*d = 35 // : 1/2

d = 35/1/2

d = 70

d = 70

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