x+x-2+x-10=42

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Solution for x+x-2+x-10=42 equation:


Simplifying
x + x + -2 + x + -10 = 42

Reorder the terms:
-2 + -10 + x + x + x = 42

Combine like terms: -2 + -10 = -12
-12 + x + x + x = 42

Combine like terms: x + x = 2x
-12 + 2x + x = 42

Combine like terms: 2x + x = 3x
-12 + 3x = 42

Solving
-12 + 3x = 42

Solving for variable 'x'.

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

Add '12' to each side of the equation.
-12 + 12 + 3x = 42 + 12

Combine like terms: -12 + 12 = 0
0 + 3x = 42 + 12
3x = 42 + 12

Combine like terms: 42 + 12 = 54
3x = 54

Divide each side by '3'.
x = 18

Simplifying
x = 18

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