(3a+7)+(a-1)=

Solution for (3a+7)+(a-1)= equation:

Simplifying
(3a + 7) + (a + -1) = 0

Reorder the terms:
(7 + 3a) + (a + -1) = 0

Remove parenthesis around (7 + 3a)
7 + 3a + (a + -1) = 0

Reorder the terms:
7 + 3a + (-1 + a) = 0

Remove parenthesis around (-1 + a)
7 + 3a + -1 + a = 0

Reorder the terms:
7 + -1 + 3a + a = 0

Combine like terms: 7 + -1 = 6
6 + 3a + a = 0

Combine like terms: 3a + a = 4a
6 + 4a = 0

Solving
6 + 4a = 0

Solving for variable 'a'.

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

Add '-6' to each side of the equation.
6 + -6 + 4a = 0 + -6

Combine like terms: 6 + -6 = 0
0 + 4a = 0 + -6
4a = 0 + -6

Combine like terms: 0 + -6 = -6
4a = -6

Divide each side by '4'.
a = -1.5

Simplifying
a = -1.5