7(2+6d)=392

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Solution for 7(2+6d)=392 equation: 


d in (-oo:+oo)

7*(6*d+2) = 392 // - 392

7*(6*d+2)-392 = 0

7*(6*d+2)-392 = 0

42*d-378 = 0

42*d-378 = 0

42*d-378 = 0 // + 378

42*d = 378 // : 42

d = 378/42

d = 9

d = 9

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