21+3y-4=12y-11-2y

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Solution for 21+3y-4=12y-11-2y equation:


Simplifying
21 + 3y + -4 = 12y + -11 + -2y

Reorder the terms:
21 + -4 + 3y = 12y + -11 + -2y

Combine like terms: 21 + -4 = 17
17 + 3y = 12y + -11 + -2y

Reorder the terms:
17 + 3y = -11 + 12y + -2y

Combine like terms: 12y + -2y = 10y
17 + 3y = -11 + 10y

Solving
17 + 3y = -11 + 10y

Solving for variable 'y'.

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

Add '-10y' to each side of the equation.
17 + 3y + -10y = -11 + 10y + -10y

Combine like terms: 3y + -10y = -7y
17 + -7y = -11 + 10y + -10y

Combine like terms: 10y + -10y = 0
17 + -7y = -11 + 0
17 + -7y = -11

Add '-17' to each side of the equation.
17 + -17 + -7y = -11 + -17

Combine like terms: 17 + -17 = 0
0 + -7y = -11 + -17
-7y = -11 + -17

Combine like terms: -11 + -17 = -28
-7y = -28

Divide each side by '-7'.
y = 4

Simplifying
y = 4

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