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0.2x+0.5x+3=5.8
We move all terms to the left:
0.2x+0.5x+3-(5.8)=0
We add all the numbers together, and all the variables
0.7x-2.8=0
We move all terms containing x to the left, all other terms to the right
0.7x=2.8
x=2.8/0.7
x=4
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