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-12+6-3=3x+48
We move all terms to the left:
-12+6-3-(3x+48)=0
We add all the numbers together, and all the variables
-(3x+48)-9=0
We get rid of parentheses
-3x-48-9=0
We add all the numbers together, and all the variables
-3x-57=0
We move all terms containing x to the left, all other terms to the right
-3x=57
x=57/-3
x=-19
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