7d+4=-2d+13 - solution

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Solution for 7d+4=-2d+13 equation:

d in (-oo:+oo)

7*d+4 = 13-2*d // - 13-2*d

7*d-(-2*d)-13+4 = 0

7*d+2*d-13+4 = 0

9*d-9 = 0 // + 9

9*d = 9 // : 9

d = 9/9

d = 1

d = 1

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