x+(x+1.2)+(x-1.2)=28.5

Solution for x+(x+1.2)+(x-1.2)=28.5 equation:

Simplifying
x + (x + 1.2) + (x + -1.2) = 28.5

Reorder the terms:
x + (1.2 + x) + (x + -1.2) = 28.5

Remove parenthesis around (1.2 + x)
x + 1.2 + x + (x + -1.2) = 28.5

Reorder the terms:
x + 1.2 + x + (-1.2 + x) = 28.5

Remove parenthesis around (-1.2 + x)
x + 1.2 + x + -1.2 + x = 28.5

Reorder the terms:
1.2 + -1.2 + x + x + x = 28.5

Combine like terms: 1.2 + -1.2 = 0.0
0.0 + x + x + x = 28.5
x + x + x = 28.5

Combine like terms: x + x = 2x
2x + x = 28.5

Combine like terms: 2x + x = 3x
3x = 28.5

Solving
3x = 28.5

Solving for variable 'x'.

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

Divide each side by '3'.
x = 9.5

Simplifying
x = 9.5