7+9a=40+a(7)-9a

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Solution for 7+9a=40+a(7)-9a equation:


Simplifying
7 + 9a = 40 + a(7) + -9a

Reorder the terms for easier multiplication:
7 + 9a = 40 + 7a + -9a

Combine like terms: 7a + -9a = -2a
7 + 9a = 40 + -2a

Solving
7 + 9a = 40 + -2a

Solving for variable 'a'.

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

Add '2a' to each side of the equation.
7 + 9a + 2a = 40 + -2a + 2a

Combine like terms: 9a + 2a = 11a
7 + 11a = 40 + -2a + 2a

Combine like terms: -2a + 2a = 0
7 + 11a = 40 + 0
7 + 11a = 40

Add '-7' to each side of the equation.
7 + -7 + 11a = 40 + -7

Combine like terms: 7 + -7 = 0
0 + 11a = 40 + -7
11a = 40 + -7

Combine like terms: 40 + -7 = 33
11a = 33

Divide each side by '11'.
a = 3

Simplifying
a = 3

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