7d+10+3d=30 - solution

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Solution for 7d+10+3d=30 equation:

d in (-oo:+oo)

7*d+3*d+10 = 30 // - 30

7*d+3*d-30+10 = 0

10*d-20 = 0 // + 20

10*d = 20 // : 10

d = 20/10

d = 2

d = 2

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