3(a+7)=21-7a

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


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

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

Add '-21' to each side of the equation.
21 + -21 + 3a = 21 + -21 + -7a

Combine like terms: 21 + -21 = 0
0 + 3a = 21 + -21 + -7a
3a = 21 + -21 + -7a

Combine like terms: 21 + -21 = 0
3a = 0 + -7a
3a = -7a

Solving
3a = -7a

Solving for variable 'a'.

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

Add '7a' to each side of the equation.
3a + 7a = -7a + 7a

Combine like terms: 3a + 7a = 10a
10a = -7a + 7a

Combine like terms: -7a + 7a = 0
10a = 0

Divide each side by '10'.
a = 0.0

Simplifying
a = 0.0

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