4(-7+7d)=-280

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Solution for 4(-7+7d)=-280 equation: 


d in (-oo:+oo)

4*(7*d-7) = -280 // + 280

4*(7*d-7)+280 = 0

4*(7*d-7)+280 = 0

28*d+252 = 0

28*d+252 = 0

28*d+252 = 0 // - 252

28*d = -252 // : 28

d = -252/28

d = -9

d = -9

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