3+4y=21

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Solution for 3+4y=21 equation: 


Simplifying
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 = 18
4y = 18

Divide each side by '4'.
y = 4.5

Simplifying
y = 4.5

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