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13x+9=16-4x+5
We move all terms to the left:
13x+9-(16-4x+5)=0
We add all the numbers together, and all the variables
13x-(-4x+21)+9=0
We get rid of parentheses
13x+4x-21+9=0
We add all the numbers together, and all the variables
17x-12=0
We move all terms containing x to the left, all other terms to the right
17x=12
x=12/17
x=12/17
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