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x+.15x+.14x=400
We move all terms to the left:
x+.15x+.14x-(400)=0
We add all the numbers together, and all the variables
1.29x-400=0
We move all terms containing x to the left, all other terms to the right
1.29x=400
x=400/1.29
x=310+0.1/1.29
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