21=y-5

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Solution for 21=y-5 equation:


Simplifying
21 = y + -5

Reorder the terms:
21 = -5 + y

Solving
21 = -5 + y

Solving for variable 'y'.

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

Add '-1y' to each side of the equation.
21 + -1y = -5 + y + -1y

Combine like terms: y + -1y = 0
21 + -1y = -5 + 0
21 + -1y = -5

Add '-21' to each side of the equation.
21 + -21 + -1y = -5 + -21

Combine like terms: 21 + -21 = 0
0 + -1y = -5 + -21
-1y = -5 + -21

Combine like terms: -5 + -21 = -26
-1y = -26

Divide each side by '-1'.
y = 26

Simplifying
y = 26

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