-2=7y+21

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Solution for -2=7y+21 equation:


Simplifying
-2 = 7y + 21

Reorder the terms:
-2 = 21 + 7y

Solving
-2 = 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.
-2 + -7y = 21 + 7y + -7y

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

Add '2' to each side of the equation.
-2 + 2 + -7y = 21 + 2

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

Combine like terms: 21 + 2 = 23
-7y = 23

Divide each side by '-7'.
y = -3.285714286

Simplifying
y = -3.285714286

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