12a-9a-3a+a-1=19

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Solution for 12a-9a-3a+a-1=19 equation:


Simplifying
12a + -9a + -3a + a + -1 = 19

Reorder the terms:
-1 + 12a + -9a + -3a + a = 19

Combine like terms: 12a + -9a = 3a
-1 + 3a + -3a + a = 19

Combine like terms: 3a + -3a = 0
-1 + 0 + a = 19
-1 + a = 19

Solving
-1 + a = 19

Solving for variable 'a'.

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

Add '1' to each side of the equation.
-1 + 1 + a = 19 + 1

Combine like terms: -1 + 1 = 0
0 + a = 19 + 1
a = 19 + 1

Combine like terms: 19 + 1 = 20
a = 20

Simplifying
a = 20

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