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13=3+2x=4
We move all terms to the left:
13-(3+2x)=0
We add all the numbers together, and all the variables
-(2x+3)+13=0
We get rid of parentheses
-2x-3+13=0
We add all the numbers together, and all the variables
-2x+10=0
We move all terms containing x to the left, all other terms to the right
-2x=-10
x=-10/-2
x=+5
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