3(7a-7)-7a=-91

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


Simplifying
3(7a + -7) + -7a = -91

Reorder the terms:
3(-7 + 7a) + -7a = -91
(-7 * 3 + 7a * 3) + -7a = -91
(-21 + 21a) + -7a = -91

Combine like terms: 21a + -7a = 14a
-21 + 14a = -91

Solving
-21 + 14a = -91

Solving for variable 'a'.

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

Add '21' to each side of the equation.
-21 + 21 + 14a = -91 + 21

Combine like terms: -21 + 21 = 0
0 + 14a = -91 + 21
14a = -91 + 21

Combine like terms: -91 + 21 = -70
14a = -70

Divide each side by '14'.
a = -5

Simplifying
a = -5

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