20a-7=-9

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Solution for 20a-7=-9 equation: 


Simplifying
20a + -7 = -9

Reorder the terms:
-7 + 20a = -9

Solving
-7 + 20a = -9

Solving for variable 'a'.

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

Add '7' to each side of the equation.
-7 + 7 + 20a = -9 + 7

Combine like terms: -7 + 7 = 0
0 + 20a = -9 + 7
20a = -9 + 7

Combine like terms: -9 + 7 = -2
20a = -2

Divide each side by '20'.
a = -0.1

Simplifying
a = -0.1

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