y-21=42

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Solution for y-21=42 equation: 


Simplifying
y + -21 = 42

Reorder the terms:
-21 + y = 42

Solving
-21 + y = 42

Solving for variable 'y'.

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

Add '21' to each side of the equation.
-21 + 21 + y = 42 + 21

Combine like terms: -21 + 21 = 0
0 + y = 42 + 21
y = 42 + 21

Combine like terms: 42 + 21 = 63
y = 63

Simplifying
y = 63

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