2y-(7-5y)-21=0

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Solution for 2y-(7-5y)-21=0 equation:


Simplifying
2y + -1(7 + -5y) + -21 = 0
2y + (7 * -1 + -5y * -1) + -21 = 0
2y + (-7 + 5y) + -21 = 0

Reorder the terms:
-7 + -21 + 2y + 5y = 0

Combine like terms: -7 + -21 = -28
-28 + 2y + 5y = 0

Combine like terms: 2y + 5y = 7y
-28 + 7y = 0

Solving
-28 + 7y = 0

Solving for variable 'y'.

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

Add '28' to each side of the equation.
-28 + 28 + 7y = 0 + 28

Combine like terms: -28 + 28 = 0
0 + 7y = 0 + 28
7y = 0 + 28

Combine like terms: 0 + 28 = 28
7y = 28

Divide each side by '7'.
y = 4

Simplifying
y = 4

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