7d-9=-139-6d - solution

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Solution for 7d-9=-139-6d equation:

d in (-oo:+oo)

7*d-9 = -(6*d)-139 // + -(6*d)-139

7*d+6*d-9+139 = 0

13*d+130 = 0 // - 130

13*d = -130 // : 13

d = -130/13

d = -10

d = -10

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