exam Maths Puzzle Numerical Ability

I need to know how to solve the equation using the distributive property.
7(6-y) = -3(y-2)

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exam Other Question

I cannot figure out how to get rid of the radical as the denominator.... Solve the system of equations by the Gaussian elimination method:
1. Solve the system of equations by the Gaussian elimination method:
2x+y-3z=1
3x-y+4z=6
x+2y-z=9

2. Sol