3y+21=2y+18

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Solution for 3y+21=2y+18 equation:


Simplifying
3y + 21 = 2y + 18

Reorder the terms:
21 + 3y = 2y + 18

Reorder the terms:
21 + 3y = 18 + 2y

Solving
21 + 3y = 18 + 2y

Solving for variable 'y'.

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

Add '-2y' to each side of the equation.
21 + 3y + -2y = 18 + 2y + -2y

Combine like terms: 3y + -2y = 1y
21 + 1y = 18 + 2y + -2y

Combine like terms: 2y + -2y = 0
21 + 1y = 18 + 0
21 + 1y = 18

Add '-21' to each side of the equation.
21 + -21 + 1y = 18 + -21

Combine like terms: 21 + -21 = 0
0 + 1y = 18 + -21
1y = 18 + -21

Combine like terms: 18 + -21 = -3
1y = -3

Divide each side by '1'.
y = -3

Simplifying
y = -3

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