-7(1-4a)=-20

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Solution for -7(1-4a)=-20 equation: 


Simplifying
-7(1 + -4a) = -20
(1 * -7 + -4a * -7) = -20
(-7 + 28a) = -20

Solving
-7 + 28a = -20

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 + 28a = -20 + 7

Combine like terms: -7 + 7 = 0
0 + 28a = -20 + 7
28a = -20 + 7

Combine like terms: -20 + 7 = -13
28a = -13

Divide each side by '28'.
a = -0.4642857143

Simplifying
a = -0.4642857143

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