book Maths Puzzle Numerical Ability

please do this for me3/9z+8=12

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book Other Question

For the following linear operator T on the vector space V, test T for diagonalizability, and if T is diagonalizable, find a basis B for V such that [T]B is a diagonal matrix.
V= M(2x2)(R) and T is defined by T(A) = A^t.
simplify each expression

9ab+8ab-7ab

how do i do this