y-4+y=20

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Solution for y-4+y=20 equation: 


Simplifying
y + -4 + y = 20

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

Combine like terms: y + y = 2y
-4 + 2y = 20

Solving
-4 + 2y = 20

Solving for variable 'y'.

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

Add '4' to each side of the equation.
-4 + 4 + 2y = 20 + 4

Combine like terms: -4 + 4 = 0
0 + 2y = 20 + 4
2y = 20 + 4

Combine like terms: 20 + 4 = 24
2y = 24

Divide each side by '2'.
y = 12

Simplifying
y = 12

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