y+2z=9

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Solution for y+2z=9 equation: 


Simplifying
y + 2z = 9

Solving
y + 2z = 9

Solving for variable 'y'.

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

Add '-2z' to each side of the equation.
y + 2z + -2z = 9 + -2z

Combine like terms: 2z + -2z = 0
y + 0 = 9 + -2z
y = 9 + -2z

Simplifying
y = 9 + -2z

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