x-3x-z=15

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Solution for x-3x-z=15 equation: 


Simplifying
x + -3x + -1z = 15

Combine like terms: x + -3x = -2x
-2x + -1z = 15

Solving
-2x + -1z = 15

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add 'z' to each side of the equation.
-2x + -1z + z = 15 + z

Combine like terms: -1z + z = 0
-2x + 0 = 15 + z
-2x = 15 + z

Divide each side by '-2'.
x = -7.5 + -0.5z

Simplifying
x = -7.5 + -0.5z

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