90=129-y

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Solution for 90=129-y equation:


Simplifying
90 = 129 + -1y

Solving
90 = 129 + -1y

Solving for variable 'y'.

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

Add 'y' to each side of the equation.
90 + y = 129 + -1y + y

Combine like terms: -1y + y = 0
90 + y = 129 + 0
90 + y = 129

Add '-90' to each side of the equation.
90 + -90 + y = 129 + -90

Combine like terms: 90 + -90 = 0
0 + y = 129 + -90
y = 129 + -90

Combine like terms: 129 + -90 = 39
y = 39

Simplifying
y = 39

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