7(1-a)=-28

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Solution for 7(1-a)=-28 equation: 


Simplifying
7(1 + -1a) = -28
(1 * 7 + -1a * 7) = -28
(7 + -7a) = -28

Solving
7 + -7a = -28

Solving for variable 'a'.

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

Add '-7' to each side of the equation.
7 + -7 + -7a = -28 + -7

Combine like terms: 7 + -7 = 0
0 + -7a = -28 + -7
-7a = -28 + -7

Combine like terms: -28 + -7 = -35
-7a = -35

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

Simplifying
a = 5

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