12y+4=7y-21

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Solution for 12y+4=7y-21 equation:


Simplifying
12y + 4 = 7y + -21

Reorder the terms:
4 + 12y = 7y + -21

Reorder the terms:
4 + 12y = -21 + 7y

Solving
4 + 12y = -21 + 7y

Solving for variable 'y'.

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

Add '-7y' to each side of the equation.
4 + 12y + -7y = -21 + 7y + -7y

Combine like terms: 12y + -7y = 5y
4 + 5y = -21 + 7y + -7y

Combine like terms: 7y + -7y = 0
4 + 5y = -21 + 0
4 + 5y = -21

Add '-4' to each side of the equation.
4 + -4 + 5y = -21 + -4

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

Combine like terms: -21 + -4 = -25
5y = -25

Divide each side by '5'.
y = -5

Simplifying
y = -5

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