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2.8x+2.8=2.5x+2.1
We move all terms to the left:
2.8x+2.8-(2.5x+2.1)=0
We get rid of parentheses
2.8x-2.5x-2.1+2.8=0
We add all the numbers together, and all the variables
0.3x+0.7=0
We move all terms containing x to the left, all other terms to the right
0.3x=-0.7
x=-0.7/0.3
x=-2+0.1/0.3
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