4y-15=21

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Solution for 4y-15=21 equation: 


Simplifying
4y + -15 = 21

Reorder the terms:
-15 + 4y = 21

Solving
-15 + 4y = 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 + 4y = 21 + 15

Combine like terms: -15 + 15 = 0
0 + 4y = 21 + 15
4y = 21 + 15

Combine like terms: 21 + 15 = 36
4y = 36

Divide each side by '4'.
y = 9

Simplifying
y = 9

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