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-37+21=3x+7x
We move all terms to the left:
-37+21-(3x+7x)=0
We add all the numbers together, and all the variables
-(+10x)-37+21=0
We add all the numbers together, and all the variables
-(+10x)-16=0
We get rid of parentheses
-10x-16=0
We move all terms containing x to the left, all other terms to the right
-10x=16
x=16/-10
x=-1+3/5
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