exam Maths Puzzle Numerical Ability

will you help me solve this problem:

9a+7b=-30
8b+5c=11
-3a+10c=73

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exam Other Question

Determine the value of k for which the system:

x + y +5z = -3
x + 2y - 5z = -1
8x + 17y + kz = -5

has no solutions.

k = ??? what is the solution of 2/x+3/7x^2