a+2a+a+20=180

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Solution for a+2a+a+20=180 equation: 


Simplifying
a + 2a + a + 20 = 180

Reorder the terms:
20 + a + 2a + a = 180

Combine like terms: a + 2a = 3a
20 + 3a + a = 180

Combine like terms: 3a + a = 4a
20 + 4a = 180

Solving
20 + 4a = 180

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 + 4a = 180 + -20

Combine like terms: 20 + -20 = 0
0 + 4a = 180 + -20
4a = 180 + -20

Combine like terms: 180 + -20 = 160
4a = 160

Divide each side by '4'.
a = 40

Simplifying
a = 40

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