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3(7x-12)=20+49+
We move all terms to the left:
3(7x-12)-(20+49+)=0
We add all the numbers together, and all the variables
3(7x-12)-0=0
We add all the numbers together, and all the variables
3(7x-12)=0
We multiply parentheses
21x-36=0
We move all terms containing x to the left, all other terms to the right
21x=36
x=36/21
x=1+5/7
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