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9=7x-13x
We move all terms to the left:
9-(7x-13x)=0
We add all the numbers together, and all the variables
-(-6x)+9=0
We get rid of parentheses
6x+9=0
We move all terms containing x to the left, all other terms to the right
6x=-9
x=-9/6
x=-1+1/2
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