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OpenStudy (anonymous):
I have an area 10m in width and 12m in length. Of that I have one sidewalk 3m in width and another which is 1m in width. I need to write an expression for the area of the sidewalks, using subtraction.
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OpenStudy (anonymous):
10*12 is all full area - (x*3+x*1)=4x 120-4x
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