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3.99+3.99x=4.89+2.99x
We move all terms to the left:
3.99+3.99x-(4.89+2.99x)=0
We add all the numbers together, and all the variables
3.99x-(2.99x+4.89)+3.99=0
We get rid of parentheses
3.99x-2.99x-4.89+3.99=0
We add all the numbers together, and all the variables
x-0.9=0
We move all terms containing x to the left, all other terms to the right
x=0.9
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