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0.3x+0.6=2.1
We move all terms to the left:
0.3x+0.6-(2.1)=0
We add all the numbers together, and all the variables
0.3x-1.5=0
We move all terms containing x to the left, all other terms to the right
0.3x=1.5
x=1.5/0.3
x=5
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