X+(X-42)=102

Solution for X+(X-42)=102 equation:

Simplifying
X + (X + -42) = 102

Reorder the terms:
X + (-42 + X) = 102

Remove parenthesis around (-42 + X)
X + -42 + X = 102

Reorder the terms:
-42 + X + X = 102

Combine like terms: X + X = 2X
-42 + 2X = 102

Solving
-42 + 2X = 102

Solving for variable 'X'.

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

Add '42' to each side of the equation.
-42 + 42 + 2X = 102 + 42

Combine like terms: -42 + 42 = 0
0 + 2X = 102 + 42
2X = 102 + 42

Combine like terms: 102 + 42 = 144
2X = 144

Divide each side by '2'.
X = 72

Simplifying
X = 72