21y+12=3y+3

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Solution for 21y+12=3y+3 equation:


Simplifying
21y + 12 = 3y + 3

Reorder the terms:
12 + 21y = 3y + 3

Reorder the terms:
12 + 21y = 3 + 3y

Solving
12 + 21y = 3 + 3y

Solving for variable 'y'.

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

Add '-3y' to each side of the equation.
12 + 21y + -3y = 3 + 3y + -3y

Combine like terms: 21y + -3y = 18y
12 + 18y = 3 + 3y + -3y

Combine like terms: 3y + -3y = 0
12 + 18y = 3 + 0
12 + 18y = 3

Add '-12' to each side of the equation.
12 + -12 + 18y = 3 + -12

Combine like terms: 12 + -12 = 0
0 + 18y = 3 + -12
18y = 3 + -12

Combine like terms: 3 + -12 = -9
18y = -9

Divide each side by '18'.
y = -0.5

Simplifying
y = -0.5

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