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3(2+7x)=-204
We move all terms to the left:
3(2+7x)-(-204)=0
We add all the numbers together, and all the variables
3(7x+2)-(-204)=0
We add all the numbers together, and all the variables
3(7x+2)+204=0
We multiply parentheses
21x+6+204=0
We add all the numbers together, and all the variables
21x+210=0
We move all terms containing x to the left, all other terms to the right
21x=-210
x=-210/21
x=-10
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