21=5y+2y

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Solution for 21=5y+2y equation:


Simplifying
21 = 5y + 2y

Combine like terms: 5y + 2y = 7y
21 = 7y

Solving
21 = 7y

Solving for variable 'y'.

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

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

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

Add '-21' to each side of the equation.
21 + -21 + -7y = 0 + -21

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

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

Divide each side by '-7'.
y = 3

Simplifying
y = 3

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