4y-(21-y)=12

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Solution for 4y-(21-y)=12 equation:


Simplifying
4y + -1(21 + -1y) = 12
4y + (21 * -1 + -1y * -1) = 12
4y + (-21 + 1y) = 12

Reorder the terms:
-21 + 4y + 1y = 12

Combine like terms: 4y + 1y = 5y
-21 + 5y = 12

Solving
-21 + 5y = 12

Solving for variable 'y'.

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

Add '21' to each side of the equation.
-21 + 21 + 5y = 12 + 21

Combine like terms: -21 + 21 = 0
0 + 5y = 12 + 21
5y = 12 + 21

Combine like terms: 12 + 21 = 33
5y = 33

Divide each side by '5'.
y = 6.6

Simplifying
y = 6.6

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