8-7d=-13

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Solution for 8-7d=-13 equation: 


d in (-oo:+oo)

8-(7*d) = -13 // + 13

8-(7*d)+13 = 0

8-7*d+13 = 0

21-7*d = 0 // - 21

-7*d = -21 // : -7

d = -21/(-7)

d = 3

d = 3

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