if ali's mom is 7less than twice the age of ali and they are 21 years apart. how old is ali

what is the equation for figuring this out?

ali is x

ali's mom is 2x+7

 

is the equation 2x+7+x=21?
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1 Answer

y=2x-7

y-x=21     or y=x+21

(2x-7) -x=21

x-7=21

x=21+7

x=28

y=x+21=28+21=49
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