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7x-13=3x+6
We move all terms to the left:
7x-13-(3x+6)=0
We get rid of parentheses
7x-3x-6-13=0
We add all the numbers together, and all the variables
4x-19=0
We move all terms containing x to the left, all other terms to the right
4x=19
x=19/4
x=4+3/4
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