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wait but how do you set up the equation?

Just do it step by step. Can you tell me if Tom is x years old now, how old is Jerry?

yup

let's talk about tom, his age must also be 9 less than his present age..
all followed ..?

yes

so you simply write it in equation form !!

okay, tom's age nine years before = (x+4)-9
do you agree..?

yes

sorry that's minus and not underscore in above equation !

ok

hopefully you understood !!

you have to use distributive proberty right?

for what ?
you know how to solve lenear equations , right ?

not really...i don't remeber how to.

thank you

:) you're welcome