21+2y-4=12y-13-5y

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Solution for 21+2y-4=12y-13-5y equation:


Simplifying
21 + 2y + -4 = 12y + -13 + -5y

Reorder the terms:
21 + -4 + 2y = 12y + -13 + -5y

Combine like terms: 21 + -4 = 17
17 + 2y = 12y + -13 + -5y

Reorder the terms:
17 + 2y = -13 + 12y + -5y

Combine like terms: 12y + -5y = 7y
17 + 2y = -13 + 7y

Solving
17 + 2y = -13 + 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.
17 + 2y + -7y = -13 + 7y + -7y

Combine like terms: 2y + -7y = -5y
17 + -5y = -13 + 7y + -7y

Combine like terms: 7y + -7y = 0
17 + -5y = -13 + 0
17 + -5y = -13

Add '-17' to each side of the equation.
17 + -17 + -5y = -13 + -17

Combine like terms: 17 + -17 = 0
0 + -5y = -13 + -17
-5y = -13 + -17

Combine like terms: -13 + -17 = -30
-5y = -30

Divide each side by '-5'.
y = 6

Simplifying
y = 6

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