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0=420-4x
We move all terms to the left:
0-(420-4x)=0
We add all the numbers together, and all the variables
-(-4x+420)+0=0
We add all the numbers together, and all the variables
-(-4x+420)=0
We get rid of parentheses
4x-420=0
We move all terms containing x to the left, all other terms to the right
4x=420
x=420/4
x=105
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