z+x=90

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Solution for z+x=90 equation: 


Simplifying
z + x = 90

Reorder the terms:
x + z = 90

Solving
x + z = 90

Solving for variable 'x'.

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

Add '-1z' to each side of the equation.
x + z + -1z = 90 + -1z

Combine like terms: z + -1z = 0
x + 0 = 90 + -1z
x = 90 + -1z

Simplifying
x = 90 + -1z

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