-6y+21=4y-9

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


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

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

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

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

Solving for variable 'y'.

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

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

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

Combine like terms: 4y + -4y = 0
21 + -10y = -9 + 0
21 + -10y = -9

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

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

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

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

Simplifying
y = 3

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