a+40+12a+7a=180

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Solution for a+40+12a+7a=180 equation: 


Simplifying
a + 40 + 12a + 7a = 180

Reorder the terms:
40 + a + 12a + 7a = 180

Combine like terms: a + 12a = 13a
40 + 13a + 7a = 180

Combine like terms: 13a + 7a = 20a
40 + 20a = 180

Solving
40 + 20a = 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 + 20a = 180 + -40

Combine like terms: 40 + -40 = 0
0 + 20a = 180 + -40
20a = 180 + -40

Combine like terms: 180 + -40 = 140
20a = 140

Divide each side by '20'.
a = 7

Simplifying
a = 7

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