10(1+d)=40

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Solution for 10(1+d)=40 equation: 



10(1+d)=40

We move all terms to the left:

10(1+d)-(40)=0

We add all the numbers together, and all the variables

10(d+1)-40=0

We multiply parentheses

10d+10-40=0

We add all the numbers together, and all the variables

10d-30=0

We move all terms containing d to the left, all other terms to the right

10d=30

d=30/10

d=3

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