exam Maths Puzzle Numerical Ability

I need help in solving this equation

solve if possible...

8 - 9t = 21t - 17

I get

- 9t = -9

-t = 1

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exam Other Question
-7+6=4a-1+20 Simplify and reduce to lowest terms

(w/45)+[(3w+2)/30]
and
[1/(10a^3b)]+[4/(ac^3)]

thanks!