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57+(6x-3)=90
We move all terms to the left:
57+(6x-3)-(90)=0
We add all the numbers together, and all the variables
(6x-3)-33=0
We get rid of parentheses
6x-3-33=0
We add all the numbers together, and all the variables
6x-36=0
We move all terms containing x to the left, all other terms to the right
6x=36
x=36/6
x=6
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