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0.8x+0.5x=6
We move all terms to the left:
0.8x+0.5x-(6)=0
We add all the numbers together, and all the variables
1.3x-6=0
We move all terms containing x to the left, all other terms to the right
1.3x=6
x=6/1.3
x=4+0.8/1.3
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