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3(7+4x)=45
We move all terms to the left:
3(7+4x)-(45)=0
We add all the numbers together, and all the variables
3(4x+7)-45=0
We multiply parentheses
12x+21-45=0
We add all the numbers together, and all the variables
12x-24=0
We move all terms containing x to the left, all other terms to the right
12x=24
x=24/12
x=2
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