13+9=100y-20-99y

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Solution for 13+9=100y-20-99y equation:


Simplifying
13 + 9 = 100y + -20 + -99y

Combine like terms: 13 + 9 = 22
22 = 100y + -20 + -99y

Reorder the terms:
22 = -20 + 100y + -99y

Combine like terms: 100y + -99y = 1y
22 = -20 + 1y

Solving
22 = -20 + 1y

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.
22 + -1y = -20 + 1y + -1y

Combine like terms: 1y + -1y = 0
22 + -1y = -20 + 0
22 + -1y = -20

Add '-22' to each side of the equation.
22 + -22 + -1y = -20 + -22

Combine like terms: 22 + -22 = 0
0 + -1y = -20 + -22
-1y = -20 + -22

Combine like terms: -20 + -22 = -42
-1y = -42

Divide each side by '-1'.
y = 42

Simplifying
y = 42

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