x+z+z=30

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Solution for x+z+z=30 equation: 


Simplifying
x + z + z = 30

Combine like terms: z + z = 2z
x + 2z = 30

Solving
x + 2z = 30

Solving for variable 'x'.

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

Add '-2z' to each side of the equation.
x + 2z + -2z = 30 + -2z

Combine like terms: 2z + -2z = 0
x + 0 = 30 + -2z
x = 30 + -2z

Simplifying
x = 30 + -2z

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