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320=200+.15x
We move all terms to the left:
320-(200+.15x)=0
We add all the numbers together, and all the variables
-(.15x+200)+320=0
We get rid of parentheses
-.15x-200+320=0
We add all the numbers together, and all the variables
-0.15x+120=0
We move all terms containing x to the left, all other terms to the right
-0.15x=-120
x=-120/-0.15
x=+800
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