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3(x+3)-7=-28
We move all terms to the left:
3(x+3)-7-(-28)=0
We add all the numbers together, and all the variables
3(x+3)+21=0
We multiply parentheses
3x+9+21=0
We add all the numbers together, and all the variables
3x+30=0
We move all terms containing x to the left, all other terms to the right
3x=-30
x=-30/3
x=-10
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