4y+5y-21=0

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Solution for 4y+5y-21=0 equation:


Simplifying
4y + 5y + -21 = 0

Reorder the terms:
-21 + 4y + 5y = 0

Combine like terms: 4y + 5y = 9y
-21 + 9y = 0

Solving
-21 + 9y = 0

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 + 9y = 0 + 21

Combine like terms: -21 + 21 = 0
0 + 9y = 0 + 21
9y = 0 + 21

Combine like terms: 0 + 21 = 21
9y = 21

Divide each side by '9'.
y = 2.333333333

Simplifying
y = 2.333333333

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