4a+9a-7a=-42

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Solution for 4a+9a-7a=-42 equation: 


Simplifying
4a + 9a + -7a = -42

Combine like terms: 4a + 9a = 13a
13a + -7a = -42

Combine like terms: 13a + -7a = 6a
6a = -42

Solving
6a = -42

Solving for variable 'a'.

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

Divide each side by '6'.
a = -7

Simplifying
a = -7

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