-21-7y=13

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Solution for -21-7y=13 equation: 


Simplifying
-21 + -7y = 13

Solving
-21 + -7y = 13

Solving for variable 'y'.

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

Add '21' to each side of the equation.
-21 + 21 + -7y = 13 + 21

Combine like terms: -21 + 21 = 0
0 + -7y = 13 + 21
-7y = 13 + 21

Combine like terms: 13 + 21 = 34
-7y = 34

Divide each side by '-7'.
y = -4.857142857

Simplifying
y = -4.857142857

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