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6x+7x-76=57-6x
We move all terms to the left:
6x+7x-76-(57-6x)=0
We add all the numbers together, and all the variables
6x+7x-(-6x+57)-76=0
We add all the numbers together, and all the variables
13x-(-6x+57)-76=0
We get rid of parentheses
13x+6x-57-76=0
We add all the numbers together, and all the variables
19x-133=0
We move all terms containing x to the left, all other terms to the right
19x=133
x=133/19
x=7
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