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0.1x+0.05(x-300)=15
We move all terms to the left:
0.1x+0.05(x-300)-(15)=0
We multiply parentheses
0.1x+0.05x-15-15=0
We add all the numbers together, and all the variables
0.15x-30=0
We move all terms containing x to the left, all other terms to the right
0.15x=30
x=30/0.15
x=200
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