4(y-9)=y+21

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Solution for 4(y-9)=y+21 equation:


Simplifying
4(y + -9) = y + 21

Reorder the terms:
4(-9 + y) = y + 21
(-9 * 4 + y * 4) = y + 21
(-36 + 4y) = y + 21

Reorder the terms:
-36 + 4y = 21 + y

Solving
-36 + 4y = 21 + y

Solving for variable 'y'.

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

Add '-1y' to each side of the equation.
-36 + 4y + -1y = 21 + y + -1y

Combine like terms: 4y + -1y = 3y
-36 + 3y = 21 + y + -1y

Combine like terms: y + -1y = 0
-36 + 3y = 21 + 0
-36 + 3y = 21

Add '36' to each side of the equation.
-36 + 36 + 3y = 21 + 36

Combine like terms: -36 + 36 = 0
0 + 3y = 21 + 36
3y = 21 + 36

Combine like terms: 21 + 36 = 57
3y = 57

Divide each side by '3'.
y = 19

Simplifying
y = 19

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