-2a+40+9a=4a-7a

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Solution for -2a+40+9a=4a-7a equation:


Simplifying
-2a + 40 + 9a = 4a + -7a

Reorder the terms:
40 + -2a + 9a = 4a + -7a

Combine like terms: -2a + 9a = 7a
40 + 7a = 4a + -7a

Combine like terms: 4a + -7a = -3a
40 + 7a = -3a

Solving
40 + 7a = -3a

Solving for variable 'a'.

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

Add '3a' to each side of the equation.
40 + 7a + 3a = -3a + 3a

Combine like terms: 7a + 3a = 10a
40 + 10a = -3a + 3a

Combine like terms: -3a + 3a = 0
40 + 10a = 0

Add '-40' to each side of the equation.
40 + -40 + 10a = 0 + -40

Combine like terms: 40 + -40 = 0
0 + 10a = 0 + -40
10a = 0 + -40

Combine like terms: 0 + -40 = -40
10a = -40

Divide each side by '10'.
a = -4

Simplifying
a = -4

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