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-5x-21=x+-3
We move all terms to the left:
-5x-21-(x+-3)=0
We add all the numbers together, and all the variables
-5x-(x-3)-21=0
We get rid of parentheses
-5x-x+3-21=0
We add all the numbers together, and all the variables
-6x-18=0
We move all terms containing x to the left, all other terms to the right
-6x=18
x=18/-6
x=-3
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