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7X+5-9X=12-15X+13X-7
We move all terms to the left:
7X+5-9X-(12-15X+13X-7)=0
We add all the numbers together, and all the variables
7X-9X-(-2X+5)+5=0
We add all the numbers together, and all the variables
-2X-(-2X+5)+5=0
We get rid of parentheses
-2X+2X-5+5=0
We add all the numbers together, and all the variables
=0
X=0/1
X=0
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