(7a+4)+(2a-4)+(3a)=180

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Solution for (7a+4)+(2a-4)+(3a)=180 equation: 


Simplifying
(7a + 4) + (2a + -4) + (3a) = 180

Reorder the terms:
(4 + 7a) + (2a + -4) + (3a) = 180

Remove parenthesis around (4 + 7a)
4 + 7a + (2a + -4) + (3a) = 180

Reorder the terms:
4 + 7a + (-4 + 2a) + (3a) = 180

Remove parenthesis around (-4 + 2a)
4 + 7a + -4 + 2a + (3a) = 180

Reorder the terms:
4 + -4 + 7a + 2a + (3a) = 180

Combine like terms: 4 + -4 = 0
0 + 7a + 2a + (3a) = 180
7a + 2a + (3a) = 180

Combine like terms: 7a + 2a = 9a
9a + (3a) = 180

Combine like terms: 9a + (3a) = 12a
12a = 180

Solving
12a = 180

Solving for variable 'a'.

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

Divide each side by '12'.
a = 15

Simplifying
a = 15

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