7[a+3]+21=91

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Solution for 7[a+3]+21=91 equation:


Simplifying
7[a + 3] + 21 = 91

Reorder the terms:
7[3 + a] + 21 = 91
[3 * 7 + a * 7] + 21 = 91
[21 + 7a] + 21 = 91

Reorder the terms:
21 + 21 + 7a = 91

Combine like terms: 21 + 21 = 42
42 + 7a = 91

Solving
42 + 7a = 91

Solving for variable 'a'.

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

Add '-42' to each side of the equation.
42 + -42 + 7a = 91 + -42

Combine like terms: 42 + -42 = 0
0 + 7a = 91 + -42
7a = 91 + -42

Combine like terms: 91 + -42 = 49
7a = 49

Divide each side by '7'.
a = 7

Simplifying
a = 7

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