2y+12=21

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Solution for 2y+12=21 equation: 


Simplifying
2y + 12 = 21

Reorder the terms:
12 + 2y = 21

Solving
12 + 2y = 21

Solving for variable 'y'.

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

Add '-12' to each side of the equation.
12 + -12 + 2y = 21 + -12

Combine like terms: 12 + -12 = 0
0 + 2y = 21 + -12
2y = 21 + -12

Combine like terms: 21 + -12 = 9
2y = 9

Divide each side by '2'.
y = 4.5

Simplifying
y = 4.5

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