x+(x-3)=81

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Solution for x+(x-3)=81 equation:


Simplifying
x + (x + -3) = 81

Reorder the terms:
x + (-3 + x) = 81

Remove parenthesis around (-3 + x)
x + -3 + x = 81

Reorder the terms:
-3 + x + x = 81

Combine like terms: x + x = 2x
-3 + 2x = 81

Solving
-3 + 2x = 81

Solving for variable 'x'.

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

Add '3' to each side of the equation.
-3 + 3 + 2x = 81 + 3

Combine like terms: -3 + 3 = 0
0 + 2x = 81 + 3
2x = 81 + 3

Combine like terms: 81 + 3 = 84
2x = 84

Divide each side by '2'.
x = 42

Simplifying
x = 42

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