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If the question was
42 + z = 46, then subtract 42 from both sides to give z = 4
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6+z = 3 z = 3-6 z = -3
To solve an equation with three unknowns, x, y and z, you require 3 independent equations.
you can not solve this equation
-7
Solve this system of equations. 5x+3y+z=-29 x-3y+2z=23 14x-2y+3z=-18 Write the solution as an ordered triple.