y-(4y-7)=5y-(y+21)

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Solution for y-(4y-7)=5y-(y+21) equation:


Simplifying
y + -1(4y + -7) = 5y + -1(y + 21)

Reorder the terms:
y + -1(-7 + 4y) = 5y + -1(y + 21)
y + (-7 * -1 + 4y * -1) = 5y + -1(y + 21)
y + (7 + -4y) = 5y + -1(y + 21)

Reorder the terms:
7 + y + -4y = 5y + -1(y + 21)

Combine like terms: y + -4y = -3y
7 + -3y = 5y + -1(y + 21)

Reorder the terms:
7 + -3y = 5y + -1(21 + y)
7 + -3y = 5y + (21 * -1 + y * -1)
7 + -3y = 5y + (-21 + -1y)

Reorder the terms:
7 + -3y = -21 + 5y + -1y

Combine like terms: 5y + -1y = 4y
7 + -3y = -21 + 4y

Solving
7 + -3y = -21 + 4y

Solving for variable 'y'.

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

Add '-4y' to each side of the equation.
7 + -3y + -4y = -21 + 4y + -4y

Combine like terms: -3y + -4y = -7y
7 + -7y = -21 + 4y + -4y

Combine like terms: 4y + -4y = 0
7 + -7y = -21 + 0
7 + -7y = -21

Add '-7' to each side of the equation.
7 + -7 + -7y = -21 + -7

Combine like terms: 7 + -7 = 0
0 + -7y = -21 + -7
-7y = -21 + -7

Combine like terms: -21 + -7 = -28
-7y = -28

Divide each side by '-7'.
y = 4

Simplifying
y = 4

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