2y-15=21

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Solution for 2y-15=21 equation: 


Simplifying
2y + -15 = 21

Reorder the terms:
-15 + 2y = 21

Solving
-15 + 2y = 21

Solving for variable 'y'.

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

Add '15' to each side of the equation.
-15 + 15 + 2y = 21 + 15

Combine like terms: -15 + 15 = 0
0 + 2y = 21 + 15
2y = 21 + 15

Combine like terms: 21 + 15 = 36
2y = 36

Divide each side by '2'.
y = 18

Simplifying
y = 18

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