21=3y+1+2y

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Solution for 21=3y+1+2y equation:


Simplifying
21 = 3y + 1 + 2y

Reorder the terms:
21 = 1 + 3y + 2y

Combine like terms: 3y + 2y = 5y
21 = 1 + 5y

Solving
21 = 1 + 5y

Solving for variable 'y'.

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

Add '-5y' to each side of the equation.
21 + -5y = 1 + 5y + -5y

Combine like terms: 5y + -5y = 0
21 + -5y = 1 + 0
21 + -5y = 1

Add '-21' to each side of the equation.
21 + -21 + -5y = 1 + -21

Combine like terms: 21 + -21 = 0
0 + -5y = 1 + -21
-5y = 1 + -21

Combine like terms: 1 + -21 = -20
-5y = -20

Divide each side by '-5'.
y = 4

Simplifying
y = 4

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