4y-3=2y+21

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Solution for 4y-3=2y+21 equation: 


Simplifying
4y + -3 = 2y + 21

Reorder the terms:
-3 + 4y = 2y + 21

Reorder the terms:
-3 + 4y = 21 + 2y

Solving
-3 + 4y = 21 + 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.
-3 + 4y + -2y = 21 + 2y + -2y

Combine like terms: 4y + -2y = 2y
-3 + 2y = 21 + 2y + -2y

Combine like terms: 2y + -2y = 0
-3 + 2y = 21 + 0
-3 + 2y = 21

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

Combine like terms: -3 + 3 = 0
0 + 2y = 21 + 3
2y = 21 + 3

Combine like terms: 21 + 3 = 24
2y = 24

Divide each side by '2'.
y = 12

Simplifying
y = 12

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