-3a-7a=-20

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Solution for -3a-7a=-20 equation: 


Simplifying
-3a + -7a = -20

Combine like terms: -3a + -7a = -10a
-10a = -20

Solving
-10a = -20

Solving for variable 'a'.

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

Divide each side by '-10'.
a = 2

Simplifying
a = 2

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