exam Maths Puzzle Numerical Ability

(-10m^-1y^0r)/(-14m^-7y^-3r^-4)i got 10m^8y^3r^4 am i right?

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(a^2-b^2)/(a+b) Solving Systems of Equations in Three Variables.
2r+s+t=14
-r+-3s+2s=-2
4r-6s+3s=-5
How do i get to the two systems of the equation using elimanation and to find the first variable?