book Maths Puzzle Numerical Ability

Yikes nobody I know knows this stuff. Please Help
Thanks bunches.

2/3y + 4 = 2x

secondly

1/2(y + 5) + 4x = 3x

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book Other Question

A bowl contains 50 colored marbles, 13 Green, 10 Red, 9 Blue, 8 Yellow, 6 Black, 4 White. If you are blindfolded, what is the smallest number of marbles you must pick to guarantee that you have at least 7 marbles of the same color? (1/2)(y+8)=-6-4(y-1)