10x+30=x+21

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Solution for 10x+30=x+21 equation: 



10x+30=x+21

We move all terms to the left:

10x+30-(x+21)=0

We get rid of parentheses

10x-x-21+30=0

We add all the numbers together, and all the variables

9x+9=0

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

9x=-9

x=-9/9

x=-1

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