2x+x+(x-80)=420

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Solution for 2x+x+(x-80)=420 equation:


Simplifying
2x + x + (x + -80) = 420

Reorder the terms:
2x + x + (-80 + x) = 420

Remove parenthesis around (-80 + x)
2x + x + -80 + x = 420

Reorder the terms:
-80 + 2x + x + x = 420

Combine like terms: 2x + x = 3x
-80 + 3x + x = 420

Combine like terms: 3x + x = 4x
-80 + 4x = 420

Solving
-80 + 4x = 420

Solving for variable 'x'.

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

Add '80' to each side of the equation.
-80 + 80 + 4x = 420 + 80

Combine like terms: -80 + 80 = 0
0 + 4x = 420 + 80
4x = 420 + 80

Combine like terms: 420 + 80 = 500
4x = 500

Divide each side by '4'.
x = 125

Simplifying
x = 125

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