91=7(1-3a)

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


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

Solving
91 = 7 + -21a

Solving for variable 'a'.

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

Add '21a' to each side of the equation.
91 + 21a = 7 + -21a + 21a

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

Add '-91' to each side of the equation.
91 + -91 + 21a = 7 + -91

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

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

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

Simplifying
a = -4

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