What is 42 -7(z-3)?

To simplify the expression (42 - 7(z - 3)), first distribute the ( -7 ) across the terms inside the parentheses: ( -7z + 21 ). Then, combine it with the 42: ( 42 + 21 - 7z = 63 - 7z). Thus, the simplified expression is (63 - 7z).