exam Maths Puzzle Numerical Ability

how to slove -9 exponet 0?

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x/5=x-2/7 Please put this into equation form: 400 tickets total sold to game. Student tickets are $2, adults $3. Total $ collected is $1050. I know that the answer is 150 student tix and 250 adult tix, but I need this in equation form.Please help.