x+x-40=280

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Solution for x+x-40=280 equation: 


Simplifying
x + x + -40 = 280

Reorder the terms:
-40 + x + x = 280

Combine like terms: x + x = 2x
-40 + 2x = 280

Solving
-40 + 2x = 280

Solving for variable 'x'.

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

Add '40' to each side of the equation.
-40 + 40 + 2x = 280 + 40

Combine like terms: -40 + 40 = 0
0 + 2x = 280 + 40
2x = 280 + 40

Combine like terms: 280 + 40 = 320
2x = 320

Divide each side by '2'.
x = 160

Simplifying
x = 160

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