2(a-78)+78=180

Solution for 2(a-78)+78=180 equation:

Simplifying
2(a + -78) + 78 = 180

Reorder the terms:
2(-78 + a) + 78 = 180
(-78 * 2 + a * 2) + 78 = 180
(-156 + 2a) + 78 = 180

Reorder the terms:
-156 + 78 + 2a = 180

Combine like terms: -156 + 78 = -78
-78 + 2a = 180

Solving
-78 + 2a = 180

Solving for variable 'a'.

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

Add '78' to each side of the equation.
-78 + 78 + 2a = 180 + 78

Combine like terms: -78 + 78 = 0
0 + 2a = 180 + 78
2a = 180 + 78

Combine like terms: 180 + 78 = 258
2a = 258

Divide each side by '2'.
a = 129

Simplifying
a = 129