21=7y+7+(y+3)

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Solution for 21=7y+7+(y+3) equation:


Simplifying
21 = 7y + 7 + (y + 3)

Reorder the terms:
21 = 7y + 7 + (3 + y)

Remove parenthesis around (3 + y)
21 = 7y + 7 + 3 + y

Reorder the terms:
21 = 7 + 3 + 7y + y

Combine like terms: 7 + 3 = 10
21 = 10 + 7y + y

Combine like terms: 7y + y = 8y
21 = 10 + 8y

Solving
21 = 10 + 8y

Solving for variable 'y'.

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

Add '-8y' to each side of the equation.
21 + -8y = 10 + 8y + -8y

Combine like terms: 8y + -8y = 0
21 + -8y = 10 + 0
21 + -8y = 10

Add '-21' to each side of the equation.
21 + -21 + -8y = 10 + -21

Combine like terms: 21 + -21 = 0
0 + -8y = 10 + -21
-8y = 10 + -21

Combine like terms: 10 + -21 = -11
-8y = -11

Divide each side by '-8'.
y = 1.375

Simplifying
y = 1.375

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