10+3d+7d=20

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Solution for 10+3d+7d=20 equation: 


d in (-oo:+oo)

3*d+7*d+10 = 20 // - 20

3*d+7*d-20+10 = 0

10*d-10 = 0 // + 10

10*d = 10 // : 10

d = 10/10

d = 1

d = 1

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