6+7d=-5d+90 - solution

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Solution for 6+7d=-5d+90 equation:

d in (-oo:+oo)

7*d+6 = 90-5*d // - 90-5*d

7*d-(-5*d)-90+6 = 0

7*d+5*d-90+6 = 0

12*d-84 = 0 // + 84

12*d = 84 // : 12

d = 84/12

d = 7

d = 7

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