exam Maths Puzzle Numerical Ability

3x-5y=7
-9x+15y=-21

solve for x and y

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exam Other Question

Simplify.
-7[27-(12-39)]=
Is the answer to this 273-189-84 ??
I a close or way off the planet??
Could anyone help explain how to figure out the following problem?
3 + _7__
n
Thank you