-4(21-7y)=56

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Solution for -4(21-7y)=56 equation: 


Simplifying
-4(21 + -7y) = 56
(21 * -4 + -7y * -4) = 56
(-84 + 28y) = 56

Solving
-84 + 28y = 56

Solving for variable 'y'.

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

Add '84' to each side of the equation.
-84 + 84 + 28y = 56 + 84

Combine like terms: -84 + 84 = 0
0 + 28y = 56 + 84
28y = 56 + 84

Combine like terms: 56 + 84 = 140
28y = 140

Divide each side by '28'.
y = 5

Simplifying
y = 5

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