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224=420-15x
We move all terms to the left:
224-(420-15x)=0
We add all the numbers together, and all the variables
-(-15x+420)+224=0
We get rid of parentheses
15x-420+224=0
We add all the numbers together, and all the variables
15x-196=0
We move all terms containing x to the left, all other terms to the right
15x=196
x=196/15
x=13+1/15
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