3(-4+7d)=-12 - solution

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Solution for 3(-4+7d)=-12 equation:

d in (-oo:+oo)

3*(7*d-4) = -12 // + 12

3*(7*d-4)+12 = 0

3*(7*d-4)+12 = 0

21*d = 0

21*d = 0

21*d = 0 // : 21

d = 0

d = 0

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