exam Maths Puzzle Numerical Ability

Solve for y in the following equations:

1. 25x-5y=15
y=_

2. 18x+6y=(-12)y
y=_

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exam Other Question

I asked this question a few days ago and I am waiting for an answer. I hope I will get one today.
Suppose that you save for retirement by contributing the same amount each month How do I work this problem?
-2[4-3(x+5)]>4(2-x)

-2(x-2)=2[x-4(x-2)+x]