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6x+4+6x+4=13x-1
We move all terms to the left:
6x+4+6x+4-(13x-1)=0
We add all the numbers together, and all the variables
12x-(13x-1)+8=0
We get rid of parentheses
12x-13x+1+8=0
We add all the numbers together, and all the variables
-1x+9=0
We move all terms containing x to the left, all other terms to the right
-x=-9
x=-9/-1
x=+9
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