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2.1x+3=2.4x+2.4
We move all terms to the left:
2.1x+3-(2.4x+2.4)=0
We get rid of parentheses
2.1x-2.4x-2.4+3=0
We add all the numbers together, and all the variables
-0.3x+0.6=0
We move all terms containing x to the left, all other terms to the right
-0.3x=-0.6
x=-0.6/-0.3
x=+2
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