3a+4-a=9

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Solution for 3a+4-a=9 equation:


Simplifying
3a + 4 + -1a = 9

Reorder the terms:
4 + 3a + -1a = 9

Combine like terms: 3a + -1a = 2a
4 + 2a = 9

Solving
4 + 2a = 9

Solving for variable 'a'.

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

Add '-4' to each side of the equation.
4 + -4 + 2a = 9 + -4

Combine like terms: 4 + -4 = 0
0 + 2a = 9 + -4
2a = 9 + -4

Combine like terms: 9 + -4 = 5
2a = 5

Divide each side by '2'.
a = 2.5

Simplifying
a = 2.5

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