10(20+d)=420

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Solution for 10(20+d)=420 equation: 



10(20+d)=420

We move all terms to the left:

10(20+d)-(420)=0

We add all the numbers together, and all the variables

10(d+20)-420=0

We multiply parentheses

10d+200-420=0

We add all the numbers together, and all the variables

10d-220=0

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

10d=220

d=220/10

d=22

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