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x+0.2*x=40
We move all terms to the left:
x+0.2*x-(40)=0
We add all the numbers together, and all the variables
1.2x-40=0
We move all terms containing x to the left, all other terms to the right
1.2x=40
x=40/1.2
x=33+0.4/1.2
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