9(-7)+7y=21

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Solution for 9(-7)+7y=21 equation: 


Simplifying
9(-7) + 7y = 21

Multiply 9 * -7
-63 + 7y = 21

Solving
-63 + 7y = 21

Solving for variable 'y'.

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

Add '63' to each side of the equation.
-63 + 63 + 7y = 21 + 63

Combine like terms: -63 + 63 = 0
0 + 7y = 21 + 63
7y = 21 + 63

Combine like terms: 21 + 63 = 84
7y = 84

Divide each side by '7'.
y = 12

Simplifying
y = 12

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