exam Maths Puzzle Numerical Ability

Solve the system by addition or substitution.
10x-5y=17
y=2x-3

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can you help me with this problem 22+x+y=3 22x + 36y = 356 university of phoenix elementary and intermediate algebra Perform the indicated operations

14x-7/x^2+3x-4 times x^2+6x+8/2x^2+5x-3 divided by x^2+2x/x^2+2x-3