Question 353872
How did you get 7?
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6xy+12xz+9yz=3xyz, solve for z.
Get all terms with a z on one side.
12xz + 9yz = 3xyz - 6xy
12xz + 9yz - 3xyz = - 6xy
Factor out the z
z*(12x + 9y - 3xy) = -6xy
Divide by the polynomial
z = -6xy/(12x + 9y - 3xy)
Reduce
z = -2xy/(4x + 3y - xy)