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