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7x+2x.3=5x+9
We move all terms to the left:
7x+2x.3-(5x+9)=0
We get rid of parentheses
7x+2x.3-5x-9=0
We add all the numbers together, and all the variables
2x+2x.3-9=0
We move all terms containing x to the left, all other terms to the right
2x+2x.3=9
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