21=7y+3(y-5)

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Solution for 21=7y+3(y-5) equation:


Simplifying
21 = 7y + 3(y + -5)

Reorder the terms:
21 = 7y + 3(-5 + y)
21 = 7y + (-5 * 3 + y * 3)
21 = 7y + (-15 + 3y)

Reorder the terms:
21 = -15 + 7y + 3y

Combine like terms: 7y + 3y = 10y
21 = -15 + 10y

Solving
21 = -15 + 10y

Solving for variable 'y'.

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

Add '-10y' to each side of the equation.
21 + -10y = -15 + 10y + -10y

Combine like terms: 10y + -10y = 0
21 + -10y = -15 + 0
21 + -10y = -15

Add '-21' to each side of the equation.
21 + -21 + -10y = -15 + -21

Combine like terms: 21 + -21 = 0
0 + -10y = -15 + -21
-10y = -15 + -21

Combine like terms: -15 + -21 = -36
-10y = -36

Divide each side by '-10'.
y = 3.6

Simplifying
y = 3.6

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