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219=84-x
We move all terms to the left:
219-(84-x)=0
We add all the numbers together, and all the variables
-(-1x+84)+219=0
We get rid of parentheses
1x-84+219=0
We add all the numbers together, and all the variables
x+135=0
We move all terms containing x to the left, all other terms to the right
x=-135
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