a-2(a-40)=9a

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Solution for a-2(a-40)=9a equation:


Simplifying
a + -2(a + -40) = 9a

Reorder the terms:
a + -2(-40 + a) = 9a
a + (-40 * -2 + a * -2) = 9a
a + (80 + -2a) = 9a

Reorder the terms:
80 + a + -2a = 9a

Combine like terms: a + -2a = -1a
80 + -1a = 9a

Solving
80 + -1a = 9a

Solving for variable 'a'.

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

Add '-9a' to each side of the equation.
80 + -1a + -9a = 9a + -9a

Combine like terms: -1a + -9a = -10a
80 + -10a = 9a + -9a

Combine like terms: 9a + -9a = 0
80 + -10a = 0

Add '-80' to each side of the equation.
80 + -80 + -10a = 0 + -80

Combine like terms: 80 + -80 = 0
0 + -10a = 0 + -80
-10a = 0 + -80

Combine like terms: 0 + -80 = -80
-10a = -80

Divide each side by '-10'.
a = 8

Simplifying
a = 8

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