-7(-4+3a)=91

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Solution for -7(-4+3a)=91 equation: 


Simplifying
-7(-4 + 3a) = 91
(-4 * -7 + 3a * -7) = 91
(28 + -21a) = 91

Solving
28 + -21a = 91

Solving for variable 'a'.

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

Add '-28' to each side of the equation.
28 + -28 + -21a = 91 + -28

Combine like terms: 28 + -28 = 0
0 + -21a = 91 + -28
-21a = 91 + -28

Combine like terms: 91 + -28 = 63
-21a = 63

Divide each side by '-21'.
a = -3

Simplifying
a = -3

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