5+2a-7a=-20

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Solution for 5+2a-7a=-20 equation: 


Simplifying
5 + 2a + -7a = -20

Combine like terms: 2a + -7a = -5a
5 + -5a = -20

Solving
5 + -5a = -20

Solving for variable 'a'.

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

Add '-5' to each side of the equation.
5 + -5 + -5a = -20 + -5

Combine like terms: 5 + -5 = 0
0 + -5a = -20 + -5
-5a = -20 + -5

Combine like terms: -20 + -5 = -25
-5a = -25

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

Simplifying
a = 5

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