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Help right here please questions 13 15 and 19 please! serious people only!

Help right here please questions 13 15 and 19 please! serious people only!-example-1
User Qu
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good luck with that, that will be hard what type of stupid teacher gives that fro real.
User MASL
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3x-20+2x=180
5x=180 +20
5x=200

x=200/5

x=40
User Jijinp
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