290=155-y

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Solution for 290=155-y equation:


Simplifying
290 = 155 + -1y

Solving
290 = 155 + -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.
290 + y = 155 + -1y + y

Combine like terms: -1y + y = 0
290 + y = 155 + 0
290 + y = 155

Add '-290' to each side of the equation.
290 + -290 + y = 155 + -290

Combine like terms: 290 + -290 = 0
0 + y = 155 + -290
y = 155 + -290

Combine like terms: 155 + -290 = -135
y = -135

Simplifying
y = -135

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