3a+8+a-9-20=

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Solution for 3a+8+a-9-20= equation:


Simplifying
3a + 8 + a + -9 + -20 = 0

Reorder the terms:
8 + -9 + -20 + 3a + a = 0

Combine like terms: 8 + -9 = -1
-1 + -20 + 3a + a = 0

Combine like terms: -1 + -20 = -21
-21 + 3a + a = 0

Combine like terms: 3a + a = 4a
-21 + 4a = 0

Solving
-21 + 4a = 0

Solving for variable 'a'.

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

Add '21' to each side of the equation.
-21 + 21 + 4a = 0 + 21

Combine like terms: -21 + 21 = 0
0 + 4a = 0 + 21
4a = 0 + 21

Combine like terms: 0 + 21 = 21
4a = 21

Divide each side by '4'.
a = 5.25

Simplifying
a = 5.25

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