exam Maths Puzzle Numerical Ability

i have a couple questions

what is the following answers?

(17)5x-7=2x+8
(18)2y+3=y+5

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exam Other Question

rationalize the denominator. Assume that all expressions under radicals represent positive numbers.

(sqrt)x -(sqrt)y / (sqrt)x + (sqrt)y Two similar cylinders have heights of 3 cm and 4 cm. Find the ratio of their volumes.