-4y-9=6y+21

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Solution for -4y-9=6y+21 equation:


Simplifying
-4y + -9 = 6y + 21

Reorder the terms:
-9 + -4y = 6y + 21

Reorder the terms:
-9 + -4y = 21 + 6y

Solving
-9 + -4y = 21 + 6y

Solving for variable 'y'.

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

Add '-6y' to each side of the equation.
-9 + -4y + -6y = 21 + 6y + -6y

Combine like terms: -4y + -6y = -10y
-9 + -10y = 21 + 6y + -6y

Combine like terms: 6y + -6y = 0
-9 + -10y = 21 + 0
-9 + -10y = 21

Add '9' to each side of the equation.
-9 + 9 + -10y = 21 + 9

Combine like terms: -9 + 9 = 0
0 + -10y = 21 + 9
-10y = 21 + 9

Combine like terms: 21 + 9 = 30
-10y = 30

Divide each side by '-10'.
y = -3

Simplifying
y = -3

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