x+(X+20)+(X+40)=90

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Solution for x+(X+20)+(X+40)=90 equation: 


Simplifying
x + (X + 20) + (X + 40) = 90

Reorder the terms:
x + (20 + X) + (X + 40) = 90

Remove parenthesis around (20 + X)
x + 20 + X + (X + 40) = 90

Reorder the terms:
x + 20 + X + (40 + X) = 90

Remove parenthesis around (40 + X)
x + 20 + X + 40 + X = 90

Reorder the terms:
20 + 40 + X + X + x = 90

Combine like terms: 20 + 40 = 60
60 + X + X + x = 90

Combine like terms: X + X = 2X
60 + 2X + x = 90

Solving
60 + 2X + x = 90

Solving for variable 'X'.

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

Add '-60' to each side of the equation.
60 + 2X + -60 + x = 90 + -60

Reorder the terms:
60 + -60 + 2X + x = 90 + -60

Combine like terms: 60 + -60 = 0
0 + 2X + x = 90 + -60
2X + x = 90 + -60

Combine like terms: 90 + -60 = 30
2X + x = 30

Add '-1x' to each side of the equation.
2X + x + -1x = 30 + -1x

Combine like terms: x + -1x = 0
2X + 0 = 30 + -1x
2X = 30 + -1x

Divide each side by '2'.
X = 15 + -0.5x

Simplifying
X = 15 + -0.5x

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