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x+.05x=690.90
We move all terms to the left:
x+.05x-(690.90)=0
We add all the numbers together, and all the variables
x+.05x-(690.9)=0
We add all the numbers together, and all the variables
1.05x-690.9=0
We move all terms containing x to the left, all other terms to the right
1.05x=690.9
x=690.9/1.05
x=658
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