7(1+3d)=7

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Solution for 7(1+3d)=7 equation: 


d in (-oo:+oo)

7*(3*d+1) = 7 // - 7

7*(3*d+1)-7 = 0

7*(3*d+1)-7 = 0

21*d = 0

21*d = 0

21*d = 0 // : 21

d = 0

d = 0

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