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2.1x-10.5=31.5-6.7
We move all terms to the left:
2.1x-10.5-(31.5-6.7)=0
We add all the numbers together, and all the variables
2.1x-10.5-(24.8)=0
We add all the numbers together, and all the variables
2.1x-35.3=0
We move all terms containing x to the left, all other terms to the right
2.1x=35.3
x=35.3/2.1
x=16+1/1.23529411765
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