7a-a-2=40

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Solution for 7a-a-2=40 equation: 


Simplifying
7a + -1a + -2 = 40

Reorder the terms:
-2 + 7a + -1a = 40

Combine like terms: 7a + -1a = 6a
-2 + 6a = 40

Solving
-2 + 6a = 40

Solving for variable 'a'.

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

Add '2' to each side of the equation.
-2 + 2 + 6a = 40 + 2

Combine like terms: -2 + 2 = 0
0 + 6a = 40 + 2
6a = 40 + 2

Combine like terms: 40 + 2 = 42
6a = 42

Divide each side by '6'.
a = 7

Simplifying
a = 7

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