exam Maths Puzzle Numerical Ability

Solve the equation

(y - 7) - (y + 6) =9y

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exam Other Question

6x-6y+6z=6
2x-4y-6z=12
10x-5y+5z=30 Slove by graphing and then get an exact solution by using either subsituition or elimination. 2x-y= -5
x+y=1