189=-7(3a-3)

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Solution for 189=-7(3a-3) equation:


Simplifying
189 = -7(3a + -3)

Reorder the terms:
189 = -7(-3 + 3a)
189 = (-3 * -7 + 3a * -7)
189 = (21 + -21a)

Solving
189 = 21 + -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.
189 + 21a = 21 + -21a + 21a

Combine like terms: -21a + 21a = 0
189 + 21a = 21 + 0
189 + 21a = 21

Add '-189' to each side of the equation.
189 + -189 + 21a = 21 + -189

Combine like terms: 189 + -189 = 0
0 + 21a = 21 + -189
21a = 21 + -189

Combine like terms: 21 + -189 = -168
21a = -168

Divide each side by '21'.
a = -8

Simplifying
a = -8

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