(a-1)+(a-7)+2a=180

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Solution for (a-1)+(a-7)+2a=180 equation:


Simplifying
(a + -1) + (a + -7) + 2a = 180

Reorder the terms:
(-1 + a) + (a + -7) + 2a = 180

Remove parenthesis around (-1 + a)
-1 + a + (a + -7) + 2a = 180

Reorder the terms:
-1 + a + (-7 + a) + 2a = 180

Remove parenthesis around (-7 + a)
-1 + a + -7 + a + 2a = 180

Reorder the terms:
-1 + -7 + a + a + 2a = 180

Combine like terms: -1 + -7 = -8
-8 + a + a + 2a = 180

Combine like terms: a + a = 2a
-8 + 2a + 2a = 180

Combine like terms: 2a + 2a = 4a
-8 + 4a = 180

Solving
-8 + 4a = 180

Solving for variable 'a'.

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

Add '8' to each side of the equation.
-8 + 8 + 4a = 180 + 8

Combine like terms: -8 + 8 = 0
0 + 4a = 180 + 8
4a = 180 + 8

Combine like terms: 180 + 8 = 188
4a = 188

Divide each side by '4'.
a = 47

Simplifying
a = 47

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