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5.2+2.1x=11.5
We move all terms to the left:
5.2+2.1x-(11.5)=0
We add all the numbers together, and all the variables
2.1x-6.3=0
We move all terms containing x to the left, all other terms to the right
2.1x=6.3
x=6.3/2.1
x=3+-8.8817841970013E-16/2.1
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