exam Maths Puzzle Numerical Ability

4-(y-3) = x+3 1st equation

10+x = 2+(y-12)2nd equation
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exam Other Question

Use the Gauss-Jordan method to solve each system of equations.
3x-6y+3z=11
2x+y-z=2
5x-5y+2z=6 Could someone help me explain: why x times x is equal to x squared not 2x. Thank you