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4x+9=7+13
We move all terms to the left:
4x+9-(7+13)=0
We add all the numbers together, and all the variables
4x+9-20=0
We add all the numbers together, and all the variables
4x-11=0
We move all terms containing x to the left, all other terms to the right
4x=11
x=11/4
x=2+3/4
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