a-19+2a+a-21=180

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Solution for a-19+2a+a-21=180 equation:


Simplifying
a + -19 + 2a + a + -21 = 180

Reorder the terms:
-19 + -21 + a + 2a + a = 180

Combine like terms: -19 + -21 = -40
-40 + a + 2a + a = 180

Combine like terms: a + 2a = 3a
-40 + 3a + a = 180

Combine like terms: 3a + a = 4a
-40 + 4a = 180

Solving
-40 + 4a = 180

Solving for variable 'a'.

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

Add '40' to each side of the equation.
-40 + 40 + 4a = 180 + 40

Combine like terms: -40 + 40 = 0
0 + 4a = 180 + 40
4a = 180 + 40

Combine like terms: 180 + 40 = 220
4a = 220

Divide each side by '4'.
a = 55

Simplifying
a = 55

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