3(10+x)=9

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Solution for 3(10+x)=9 equation: 



3(10+x)=9

We move all terms to the left:

3(10+x)-(9)=0

We add all the numbers together, and all the variables

3(x+10)-9=0

We multiply parentheses

3x+30-9=0

We add all the numbers together, and all the variables

3x+21=0

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

3x=-21

x=-21/3

x=-7

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