4y=y-(-21)

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


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

Multiply -1 * -21
4y = y + 21

Reorder the terms:
4y = 21 + y

Solving
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.
4y + -1y = 21 + y + -1y

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

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

Divide each side by '3'.
y = 7

Simplifying
y = 7

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