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2.5x+6=5x-2.1
We move all terms to the left:
2.5x+6-(5x-2.1)=0
We get rid of parentheses
2.5x-5x+2.1+6=0
We add all the numbers together, and all the variables
-2.5x+8.1=0
We move all terms containing x to the left, all other terms to the right
-2.5x=-8.1
x=-8.1/-2.5
x=3+0.6/2.5
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