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3(6+7x)=207
We move all terms to the left:
3(6+7x)-(207)=0
We add all the numbers together, and all the variables
3(7x+6)-207=0
We multiply parentheses
21x+18-207=0
We add all the numbers together, and all the variables
21x-189=0
We move all terms containing x to the left, all other terms to the right
21x=189
x=189/21
x=9
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