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x*2*3.14=439.6
We move all terms to the left:
x*2*3.14-(439.6)=0
We add all the numbers together, and all the variables
x*2*3.14-439.6=0
Wy multiply elements
6.28x*3-439.6=0
We move all terms containing x to the left, all other terms to the right
6.28x*3=439.6
x=439.6/1
x=439.6
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