-3y-12=4y+9

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Solution for -3y-12=4y+9 equation:


Simplifying
-3y + -12 = 4y + 9

Reorder the terms:
-12 + -3y = 4y + 9

Reorder the terms:
-12 + -3y = 9 + 4y

Solving
-12 + -3y = 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.
-12 + -3y + -4y = 9 + 4y + -4y

Combine like terms: -3y + -4y = -7y
-12 + -7y = 9 + 4y + -4y

Combine like terms: 4y + -4y = 0
-12 + -7y = 9 + 0
-12 + -7y = 9

Add '12' to each side of the equation.
-12 + 12 + -7y = 9 + 12

Combine like terms: -12 + 12 = 0
0 + -7y = 9 + 12
-7y = 9 + 12

Combine like terms: 9 + 12 = 21
-7y = 21

Divide each side by '-7'.
y = -3

Simplifying
y = -3

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