-a+4a-7a=20

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Solution for -a+4a-7a=20 equation: 


Simplifying
-1a + 4a + -7a = 20

Combine like terms: -1a + 4a = 3a
3a + -7a = 20

Combine like terms: 3a + -7a = -4a
-4a = 20

Solving
-4a = 20

Solving for variable 'a'.

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

Divide each side by '-4'.
a = -5

Simplifying
a = -5

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