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0.8x+0.5x=850
We move all terms to the left:
0.8x+0.5x-(850)=0
We add all the numbers together, and all the variables
1.3x-850=0
We move all terms containing x to the left, all other terms to the right
1.3x=850
x=850/1.3
x=653+1/1.1818181818182
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