-1a-3+7=3a

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

Simplifying
-1a + -3 + 7 = 3a

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

Combine like terms: -3 + 7 = 4
4 + -1a = 3a

Solving
4 + -1a = 3a

Solving for variable 'a'.

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

Add '-3a' to each side of the equation.
4 + -1a + -3a = 3a + -3a

Combine like terms: -1a + -3a = -4a
4 + -4a = 3a + -3a

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

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

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

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

Divide each side by '-4'.
a = 1

Simplifying
a = 1