91=7(-5a-2)

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Solution for 91=7(-5a-2) equation:


Simplifying
91 = 7(-5a + -2)

Reorder the terms:
91 = 7(-2 + -5a)
91 = (-2 * 7 + -5a * 7)
91 = (-14 + -35a)

Solving
91 = -14 + -35a

Solving for variable 'a'.

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

Add '35a' to each side of the equation.
91 + 35a = -14 + -35a + 35a

Combine like terms: -35a + 35a = 0
91 + 35a = -14 + 0
91 + 35a = -14

Add '-91' to each side of the equation.
91 + -91 + 35a = -14 + -91

Combine like terms: 91 + -91 = 0
0 + 35a = -14 + -91
35a = -14 + -91

Combine like terms: -14 + -91 = -105
35a = -105

Divide each side by '35'.
a = -3

Simplifying
a = -3

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