243=9-y

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Solution for 243=9-y equation:


Simplifying
243 = 9 + -1y

Solving
243 = 9 + -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.
243 + y = 9 + -1y + y

Combine like terms: -1y + y = 0
243 + y = 9 + 0
243 + y = 9

Add '-243' to each side of the equation.
243 + -243 + y = 9 + -243

Combine like terms: 243 + -243 = 0
0 + y = 9 + -243
y = 9 + -243

Combine like terms: 9 + -243 = -234
y = -234

Simplifying
y = -234

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