4y+5y-6=21

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Solution for 4y+5y-6=21 equation: 


Simplifying
4y + 5y + -6 = 21

Reorder the terms:
-6 + 4y + 5y = 21

Combine like terms: 4y + 5y = 9y
-6 + 9y = 21

Solving
-6 + 9y = 21

Solving for variable 'y'.

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

Add '6' to each side of the equation.
-6 + 6 + 9y = 21 + 6

Combine like terms: -6 + 6 = 0
0 + 9y = 21 + 6
9y = 21 + 6

Combine like terms: 21 + 6 = 27
9y = 27

Divide each side by '9'.
y = 3

Simplifying
y = 3

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