7(8)-7y=21

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Solution for 7(8)-7y=21 equation: 


Simplifying
7(8) + -7y = 21

Multiply 7 * 8
56 + -7y = 21

Solving
56 + -7y = 21

Solving for variable 'y'.

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

Add '-56' to each side of the equation.
56 + -56 + -7y = 21 + -56

Combine like terms: 56 + -56 = 0
0 + -7y = 21 + -56
-7y = 21 + -56

Combine like terms: 21 + -56 = -35
-7y = -35

Divide each side by '-7'.
y = 5

Simplifying
y = 5

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