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4(3x+6)=45+57
We move all terms to the left:
4(3x+6)-(45+57)=0
We add all the numbers together, and all the variables
4(3x+6)-102=0
We multiply parentheses
12x+24-102=0
We add all the numbers together, and all the variables
12x-78=0
We move all terms containing x to the left, all other terms to the right
12x=78
x=78/12
x=6+1/2
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