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x-x*0.15=300
We move all terms to the left:
x-x*0.15-(300)=0
Wy multiply elements
x-0.15x-300=0
We add all the numbers together, and all the variables
0.85x-300=0
We move all terms containing x to the left, all other terms to the right
0.85x=300
x=300/0.85
x=352+0.80000000000001/0.85
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