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

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


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

Reorder the terms:
91 = -21 + -7a + -21a

Combine like terms: -7a + -21a = -28a
91 = -21 + -28a

Solving
91 = -21 + -28a

Solving for variable 'a'.

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

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

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

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

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

Combine like terms: -21 + -91 = -112
28a = -112

Divide each side by '28'.
a = -4

Simplifying
a = -4

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