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4x+9=1x+15
We move all terms to the left:
4x+9-(1x+15)=0
We add all the numbers together, and all the variables
4x-(x+15)+9=0
We get rid of parentheses
4x-x-15+9=0
We add all the numbers together, and all the variables
3x-6=0
We move all terms containing x to the left, all other terms to the right
3x=6
x=6/3
x=2
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