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0=13x+630-7x
We move all terms to the left:
0-(13x+630-7x)=0
We add all the numbers together, and all the variables
-(6x+630)+0=0
We add all the numbers together, and all the variables
-(6x+630)=0
We get rid of parentheses
-6x-630=0
We move all terms containing x to the left, all other terms to the right
-6x=630
x=630/-6
x=-105
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