exam Maths Puzzle Numerical Ability

solving equations and formulas chapter 3-6 12-30 even and 34
12 ex-2y=3z for x
14 3/5 times y + a=b for y
16 y=mx+b for m
18 b times y+2 divided by 3=c for y
20 P=Esquared di

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6(-3)/(-32)

/ means divide a picture frame measures 34cm by 17cm. There is a 318cm^2 of picture showing. The frame is uniform thickness. Find the thickness of thr frame.