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I really need some help

I really need some help-example-1
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User Miguelr
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7. 1/3(9x + 18) = 3x + 6 each side is 3x + 6

8. 5x+20 does NOT equal 5(x+20) because 5(x+20) = 5x + 100

9. Perimeter= 4n, Area= n squared

10. ( left to right) 4, 2a, b
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User Arun SS
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