-y+30=9

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Solution for -y+30=9 equation: 


Simplifying
-1y + 30 = 9

Reorder the terms:
30 + -1y = 9

Solving
30 + -1y = 9

Solving for variable 'y'.

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

Add '-30' to each side of the equation.
30 + -30 + -1y = 9 + -30

Combine like terms: 30 + -30 = 0
0 + -1y = 9 + -30
-1y = 9 + -30

Combine like terms: 9 + -30 = -21
-1y = -21

Divide each side by '-1'.
y = 21

Simplifying
y = 21

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