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x+0.04x=143
We move all terms to the left:
x+0.04x-(143)=0
We add all the numbers together, and all the variables
1.04x-143=0
We move all terms containing x to the left, all other terms to the right
1.04x=143
x=143/1.04
x=137+0.51999999999998/1.04
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