3(-7)-7y=21

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


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

Multiply 3 * -7
-21 + -7y = 21

Solving
-21 + -7y = 21

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 = 21 + 21

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

Combine like terms: 21 + 21 = 42
-7y = 42

Divide each side by '-7'.
y = -6

Simplifying
y = -6

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