3a+4-a+2=10

Solution for 3a+4-a+2=10 equation:

Simplifying
3a + 4 + -1a + 2 = 10

Reorder the terms:
4 + 2 + 3a + -1a = 10

Combine like terms: 4 + 2 = 6
6 + 3a + -1a = 10

Combine like terms: 3a + -1a = 2a
6 + 2a = 10

Solving
6 + 2a = 10

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 + 2a = 10 + -6

Combine like terms: 6 + -6 = 0
0 + 2a = 10 + -6
2a = 10 + -6

Combine like terms: 10 + -6 = 4
2a = 4

Divide each side by '2'.
a = 2

Simplifying
a = 2