(-17a)+12a-4a+(-20)=7

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Solution for (-17a)+12a-4a+(-20)=7 equation: 


Simplifying
(-17a) + 12a + -4a + (-20) = 7
(-17a) + 12a + -4a + -20 = 7

Reorder the terms:
-20 + (-17a) + 12a + -4a = 7

Combine like terms: (-17a) + 12a = -5a
-20 + -5a + -4a = 7

Combine like terms: -5a + -4a = -9a
-20 + -9a = 7

Solving
-20 + -9a = 7

Solving for variable 'a'.

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

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

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

Combine like terms: 7 + 20 = 27
-9a = 27

Divide each side by '-9'.
a = -3

Simplifying
a = -3

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