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