x+x-18=84

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Solution for x+x-18=84 equation:


Simplifying
x + x + -18 = 84

Reorder the terms:
-18 + x + x = 84

Combine like terms: x + x = 2x
-18 + 2x = 84

Solving
-18 + 2x = 84

Solving for variable 'x'.

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

Add '18' to each side of the equation.
-18 + 18 + 2x = 84 + 18

Combine like terms: -18 + 18 = 0
0 + 2x = 84 + 18
2x = 84 + 18

Combine like terms: 84 + 18 = 102
2x = 102

Divide each side by '2'.
x = 51

Simplifying
x = 51

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