7a-8=4+9

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Solution for 7a-8=4+9 equation: 


Simplifying
7a + -8 = 4 + 9

Reorder the terms:
-8 + 7a = 4 + 9

Combine like terms: 4 + 9 = 13
-8 + 7a = 13

Solving
-8 + 7a = 13

Solving for variable 'a'.

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

Add '8' to each side of the equation.
-8 + 8 + 7a = 13 + 8

Combine like terms: -8 + 8 = 0
0 + 7a = 13 + 8
7a = 13 + 8

Combine like terms: 13 + 8 = 21
7a = 21

Divide each side by '7'.
a = 3

Simplifying
a = 3

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