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x+2+3(x+4)=30
We move all terms to the left:
x+2+3(x+4)-(30)=0
We add all the numbers together, and all the variables
x+3(x+4)-28=0
We multiply parentheses
x+3x+12-28=0
We add all the numbers together, and all the variables
4x-16=0
We move all terms containing x to the left, all other terms to the right
4x=16
x=16/4
x=4
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