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3x+9+4(x=10)=0
We move all terms to the left:
3x+9+4(x-(10))=0
We multiply parentheses
3x+4x-40+9=0
We add all the numbers together, and all the variables
7x-31=0
We move all terms containing x to the left, all other terms to the right
7x=31
x=31/7
x=4+3/7
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