X+(X-21)=87

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Solution for X+(X-21)=87 equation:


Simplifying
X + (X + -21) = 87

Reorder the terms:
X + (-21 + X) = 87

Remove parenthesis around (-21 + X)
X + -21 + X = 87

Reorder the terms:
-21 + X + X = 87

Combine like terms: X + X = 2X
-21 + 2X = 87

Solving
-21 + 2X = 87

Solving for variable 'X'.

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

Add '21' to each side of the equation.
-21 + 21 + 2X = 87 + 21

Combine like terms: -21 + 21 = 0
0 + 2X = 87 + 21
2X = 87 + 21

Combine like terms: 87 + 21 = 108
2X = 108

Divide each side by '2'.
X = 54

Simplifying
X = 54

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