-7a=4a+5a

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Solution for -7a=4a+5a equation: 


Simplifying
-7a = 4a + 5a

Combine like terms: 4a + 5a = 9a
-7a = 9a

Solving
-7a = 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.
-7a + -9a = 9a + -9a

Combine like terms: -7a + -9a = -16a
-16a = 9a + -9a

Combine like terms: 9a + -9a = 0
-16a = 0

Divide each side by '-16'.
a = 0

Simplifying
a = 0

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