Question: Calculate orthogonal vector

hi, i've the following task to solve with maple. 2 vectors: r:= Vector([-2,-3,2]) and s:= Vector([4,3,-3]) i've to find the vector t that is orthogonal to r and s. the length of the vector t have to be 7. (i am not allowed to use the commands CrossProduct() and VectorAngle()) i solved this task already on paper but i don't know how to key in the commands in maple to calculate it in maple. this is my try : Mat_r_s:=
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