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1.3-0.8x-2.8+0.3x=2.5
We move all terms to the left:
1.3-0.8x-2.8+0.3x-(2.5)=0
We add all the numbers together, and all the variables
-0.5x-4=0
We move all terms containing x to the left, all other terms to the right
-0.5x=4
x=4/-0.5
x=-8
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