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3x+2.9=x+2.4
We move all terms to the left:
3x+2.9-(x+2.4)=0
We get rid of parentheses
3x-x-2.4+2.9=0
We add all the numbers together, and all the variables
2x+0.5=0
We move all terms containing x to the left, all other terms to the right
2x=-0.5
x=-0.5/2
x=-0.5/2
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