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6x+13=9x+4
We move all terms to the left:
6x+13-(9x+4)=0
We get rid of parentheses
6x-9x-4+13=0
We add all the numbers together, and all the variables
-3x+9=0
We move all terms containing x to the left, all other terms to the right
-3x=-9
x=-9/-3
x=+3
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