exam Maths Puzzle Numerical Ability

Have You ever heard of Everyday Mathematics? I am in 6 th grade my parents and I do not understand the problems. It is Unit 6 Checking Proggress.

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exam Other Question
3x+2y=-2
2x-3z=1
0.4x-0.5z=-2.1 Compute the inverse of the transformation f(x,y,z) = (x + 2y -z, x -2y -z, x + 6y + z).