a+21=3(-3a+7)

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Solution for a+21=3(-3a+7) equation:


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

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

Reorder the terms:
21 + a = 3(7 + -3a)
21 + a = (7 * 3 + -3a * 3)
21 + a = (21 + -9a)

Add '-21' to each side of the equation.
21 + -21 + a = 21 + -21 + -9a

Combine like terms: 21 + -21 = 0
0 + a = 21 + -21 + -9a
a = 21 + -21 + -9a

Combine like terms: 21 + -21 = 0
a = 0 + -9a
a = -9a

Solving
a = -9a

Solving for variable 'a'.

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

Add '9a' to each side of the equation.
a + 9a = -9a + 9a

Combine like terms: a + 9a = 10a
10a = -9a + 9a

Combine like terms: -9a + 9a = 0
10a = 0

Divide each side by '10'.
a = 0.0

Simplifying
a = 0.0

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