10d+10(9)=21

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Solution for 10d+10(9)=21 equation: 



10d+10(9)=21

We move all terms to the left:

10d+10(9)-(21)=0

We add all the numbers together, and all the variables

10d+88=0

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

10d=-88

d=-88/10

d=-8+4/5

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