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1.8x+2.8=2.5x+12.1
We move all terms to the left:
1.8x+2.8-(2.5x+12.1)=0
We get rid of parentheses
1.8x-2.5x-12.1+2.8=0
We add all the numbers together, and all the variables
-0.7x-9.3=0
We move all terms containing x to the left, all other terms to the right
-0.7x=9.3
x=9.3/-0.7
x=-13+0.2/0.7
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