exam Maths Puzzle Numerical Ability

3/5x-2/9y=-13
x=15
solve for y
my work...
3/5(15)-2/9y=-13
45/5-2/9y=-13
9-2/9y=-13
9+13=2/9y
(9/2)22=2/9y(9/2)
99=y

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