20+9y=y+100

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Solution for 20+9y=y+100 equation:


Simplifying
20 + 9y = y + 100

Reorder the terms:
20 + 9y = 100 + y

Solving
20 + 9y = 100 + y

Solving for variable 'y'.

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

Add '-1y' to each side of the equation.
20 + 9y + -1y = 100 + y + -1y

Combine like terms: 9y + -1y = 8y
20 + 8y = 100 + y + -1y

Combine like terms: y + -1y = 0
20 + 8y = 100 + 0
20 + 8y = 100

Add '-20' to each side of the equation.
20 + -20 + 8y = 100 + -20

Combine like terms: 20 + -20 = 0
0 + 8y = 100 + -20
8y = 100 + -20

Combine like terms: 100 + -20 = 80
8y = 80

Divide each side by '8'.
y = 10

Simplifying
y = 10

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