-7(1-3a)=-91

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Solution for -7(1-3a)=-91 equation: 


Simplifying
-7(1 + -3a) = -91
(1 * -7 + -3a * -7) = -91
(-7 + 21a) = -91

Solving
-7 + 21a = -91

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 + 21a = -91 + 7

Combine like terms: -7 + 7 = 0
0 + 21a = -91 + 7
21a = -91 + 7

Combine like terms: -91 + 7 = -84
21a = -84

Divide each side by '21'.
a = -4

Simplifying
a = -4

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