120+120+120+(x+10)+x=720

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Solution for 120+120+120+(x+10)+x=720 equation: 


Simplifying
120 + 120 + 120 + (x + 10) + x = 720

Reorder the terms:
120 + 120 + 120 + (10 + x) + x = 720

Remove parenthesis around (10 + x)
120 + 120 + 120 + 10 + x + x = 720

Combine like terms: 120 + 120 = 240
240 + 120 + 10 + x + x = 720

Combine like terms: 240 + 120 = 360
360 + 10 + x + x = 720

Combine like terms: 360 + 10 = 370
370 + x + x = 720

Combine like terms: x + x = 2x
370 + 2x = 720

Solving
370 + 2x = 720

Solving for variable 'x'.

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

Add '-370' to each side of the equation.
370 + -370 + 2x = 720 + -370

Combine like terms: 370 + -370 = 0
0 + 2x = 720 + -370
2x = 720 + -370

Combine like terms: 720 + -370 = 350
2x = 350

Divide each side by '2'.
x = 175

Simplifying
x = 175

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