4y-3=21

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Solution for 4y-3=21 equation: 


Simplifying
4y + -3 = 21

Reorder the terms:
-3 + 4y = 21

Solving
-3 + 4y = 21

Solving for variable 'y'.

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

Add '3' to each side of the equation.
-3 + 3 + 4y = 21 + 3

Combine like terms: -3 + 3 = 0
0 + 4y = 21 + 3
4y = 21 + 3

Combine like terms: 21 + 3 = 24
4y = 24

Divide each side by '4'.
y = 6

Simplifying
y = 6

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