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4(9+x)=84
We move all terms to the left:
4(9+x)-(84)=0
We add all the numbers together, and all the variables
4(x+9)-84=0
We multiply parentheses
4x+36-84=0
We add all the numbers together, and all the variables
4x-48=0
We move all terms containing x to the left, all other terms to the right
4x=48
x=48/4
x=12
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