book Maths Puzzle Numerical Ability

x+0.02x=255

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Having trouble This Problem in my Algabra class.
The problem is
Which of the ordered pairs
(-1, 2), (7, 0), (3, -1), (-17, 6)
are solutions for the equation x + 4y = 7?


Thnks you
Simplifying complex fractions has got me down. can you help me with this one?
4x/6y
_____
2/12y
thanks!