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40=215-x
We move all terms to the left:
40-(215-x)=0
We add all the numbers together, and all the variables
-(-1x+215)+40=0
We get rid of parentheses
1x-215+40=0
We add all the numbers together, and all the variables
x-175=0
We move all terms containing x to the left, all other terms to the right
x=175
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