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43=3-x
We move all terms to the left:
43-(3-x)=0
We add all the numbers together, and all the variables
-(-1x+3)+43=0
We get rid of parentheses
1x-3+43=0
We add all the numbers together, and all the variables
x+40=0
We move all terms containing x to the left, all other terms to the right
x=-40
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