exam Maths Puzzle Numerical Ability

I need help working out these equations. My teacher made these problems up.
-8+t/3=7

4(x+3)=20

4y+3
_____ =9
7

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exam Other Question
log base 2 (x-3) = log base 2 (x-2) Ricardo is 4 years less than twice as old as his sister. The sum of their ages is 20. How old is Ricardo?