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well if u look at it, you have to solve for 3 variables. X, Y, Z
You got enough equations to solve for the variables.
Express Y in terms of X only and Z in terms of X only.
Y = X/2 + 9 and Z = 2(Y-9) - 1
Now subsitute them into the plane equations. Now you have only one variable to solve, that is X.
than you can sovle for Y and Z !
hope that helps
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