7d-7=2d+13

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Solution for 7d-7=2d+13 equation: 


d in (-oo:+oo)

7*d-7 = 2*d+13 // - 2*d+13

7*d-(2*d)-13-7 = 0

7*d-2*d-13-7 = 0

5*d-20 = 0 // + 20

5*d = 20 // : 5

d = 20/5

d = 4

d = 4

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