book Maths Puzzle Numerical Ability

3a-2b+7c=13
a+8b-6c=-47
7a-9b-9c=-3

find a,b, and c
THX

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book Other Question

need to solve and graph
|2 - x/4 | - 3 >= 1

I came up with
x >= -2

dont know if this is correct...as I multiplied each side by 4 to get rid of the fraction...then solved fo the value of a building lot this year is $78,000. this is three times its value 18 years ago. find its value 18 years ago.