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2.1x+5.3=12.02
We move all terms to the left:
2.1x+5.3-(12.02)=0
We add all the numbers together, and all the variables
2.1x-6.72=0
We move all terms containing x to the left, all other terms to the right
2.1x=6.72
x=6.72/2.1
x=3+0.42/2.1
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