exam Maths Puzzle Numerical Ability

A two-digit number is three less than seven times the sum of its digits. If the digits are reversed, the new number is 18 less than the original number. What is the original number?

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can you please help me in these solution I really i appriciated thank you

1) Multiply: [(1/4)z + (1/3)][(1/4)z - (1/5)]



2)Simplify and evaluate:
(22x5y-3z4/40x-2y-8z5)3
thank you so much How to do you graph the problem with a function like this y=21-2x