21y+(-13)-20y=8

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Solution for 21y+(-13)-20y=8 equation:


Simplifying
21y + (-13) + -20y = 8
21y + -13 + -20y = 8

Reorder the terms:
-13 + 21y + -20y = 8

Combine like terms: 21y + -20y = 1y
-13 + 1y = 8

Solving
-13 + 1y = 8

Solving for variable 'y'.

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

Add '13' to each side of the equation.
-13 + 13 + 1y = 8 + 13

Combine like terms: -13 + 13 = 0
0 + 1y = 8 + 13
1y = 8 + 13

Combine like terms: 8 + 13 = 21
1y = 21

Divide each side by '1'.
y = 21

Simplifying
y = 21

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