exam Maths Puzzle Numerical Ability

hi,i need help to how to get started in a problem

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I keep working the problem and get a fraction as an answer. I get w= -17/2
-5/8(16w - 24) + 35 Factor the following polynomial.

3x(*SQUARED) - 15x + 18

couldnt make the 2 smaller so wrote it out
should be written as "three x squared minus fifteen x plus eighteen