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4x+9=4x+5x
We move all terms to the left:
4x+9-(4x+5x)=0
We add all the numbers together, and all the variables
4x-(+9x)+9=0
We get rid of parentheses
4x-9x+9=0
We add all the numbers together, and all the variables
-5x+9=0
We move all terms containing x to the left, all other terms to the right
-5x=-9
x=-9/-5
x=1+4/5
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