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4x-9=3.5x-0
We move all terms to the left:
4x-9-(3.5x-0)=0
We add all the numbers together, and all the variables
4x-(+3.5x)-9=0
We get rid of parentheses
4x-3.5x-9=0
We add all the numbers together, and all the variables
0.5x-9=0
We move all terms containing x to the left, all other terms to the right
0.5x=9
x=9/0.5
x=18
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