3a+21=7(6+3)

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Solution for 3a+21=7(6+3) equation:


Simplifying
3a + 21 = 7(6 + 3)

Reorder the terms:
21 + 3a = 7(6 + 3)

Combine like terms: 6 + 3 = 9
21 + 3a = 7(9)

Multiply 7 * 9
21 + 3a = 63

Solving
21 + 3a = 63

Solving for variable 'a'.

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

Add '-21' to each side of the equation.
21 + -21 + 3a = 63 + -21

Combine like terms: 21 + -21 = 0
0 + 3a = 63 + -21
3a = 63 + -21

Combine like terms: 63 + -21 = 42
3a = 42

Divide each side by '3'.
a = 14

Simplifying
a = 14

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