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