21y-8=20y+4

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Solution for 21y-8=20y+4 equation:


Simplifying
21y + -8 = 20y + 4

Reorder the terms:
-8 + 21y = 20y + 4

Reorder the terms:
-8 + 21y = 4 + 20y

Solving
-8 + 21y = 4 + 20y

Solving for variable 'y'.

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

Add '-20y' to each side of the equation.
-8 + 21y + -20y = 4 + 20y + -20y

Combine like terms: 21y + -20y = 1y
-8 + 1y = 4 + 20y + -20y

Combine like terms: 20y + -20y = 0
-8 + 1y = 4 + 0
-8 + 1y = 4

Add '8' to each side of the equation.
-8 + 8 + 1y = 4 + 8

Combine like terms: -8 + 8 = 0
0 + 1y = 4 + 8
1y = 4 + 8

Combine like terms: 4 + 8 = 12
1y = 12

Divide each side by '1'.
y = 12

Simplifying
y = 12

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