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2.9x+400=8.41=20x
We move all terms to the left:
2.9x+400-(8.41)=0
We add all the numbers together, and all the variables
2.9x+391.59=0
We move all terms containing x to the left, all other terms to the right
2.9x=-391.59
x=-391.59/2.9
x=-135+0.089999999999975/2.9
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