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2.5x+3=2.1x+5
We move all terms to the left:
2.5x+3-(2.1x+5)=0
We get rid of parentheses
2.5x-2.1x-5+3=0
We add all the numbers together, and all the variables
0.4x-2=0
We move all terms containing x to the left, all other terms to the right
0.4x=2
x=2/0.4
x=5
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