(a+4)+(a+3)=21

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Solution for (a+4)+(a+3)=21 equation:


Simplifying
(a + 4) + (a + 3) = 21

Reorder the terms:
(4 + a) + (a + 3) = 21

Remove parenthesis around (4 + a)
4 + a + (a + 3) = 21

Reorder the terms:
4 + a + (3 + a) = 21

Remove parenthesis around (3 + a)
4 + a + 3 + a = 21

Reorder the terms:
4 + 3 + a + a = 21

Combine like terms: 4 + 3 = 7
7 + a + a = 21

Combine like terms: a + a = 2a
7 + 2a = 21

Solving
7 + 2a = 21

Solving for variable 'a'.

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

Add '-7' to each side of the equation.
7 + -7 + 2a = 21 + -7

Combine like terms: 7 + -7 = 0
0 + 2a = 21 + -7
2a = 21 + -7

Combine like terms: 21 + -7 = 14
2a = 14

Divide each side by '2'.
a = 7

Simplifying
a = 7

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