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x+0.2x=429.11
We move all terms to the left:
x+0.2x-(429.11)=0
We add all the numbers together, and all the variables
1.2x-429.11=0
We move all terms containing x to the left, all other terms to the right
1.2x=429.11
x=429.11/1.2
x=357+0.71/1.2
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