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I need help with this too

I need help with this too-example-1

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2a+ 3a +1+2a-3=40
7a-2=40
7a=42
a=6 so 2a=12, 3a+1 = 19; 2a-3 = 12-3=9 so the shortest side is 9 and the longest is 19 so the difference is 10
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