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43=13+3x
We move all terms to the left:
43-(13+3x)=0
We add all the numbers together, and all the variables
-(3x+13)+43=0
We get rid of parentheses
-3x-13+43=0
We add all the numbers together, and all the variables
-3x+30=0
We move all terms containing x to the left, all other terms to the right
-3x=-30
x=-30/-3
x=+10
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