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4.x-5=2.x+9
We move all terms to the left:
4.x-5-(2.x+9)=0
We get rid of parentheses
4.x-2.x-9-5=0
We add all the numbers together, and all the variables
2x-14=0
We move all terms containing x to the left, all other terms to the right
2x=14
x=14/2
x=7
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