(20+X)-81=74

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Solution for (20+X)-81=74 equation:


Simplifying
(20 + X) + -81 = 74

Remove parenthesis around (20 + X)
20 + X + -81 = 74

Reorder the terms:
20 + -81 + X = 74

Combine like terms: 20 + -81 = -61
-61 + X = 74

Solving
-61 + X = 74

Solving for variable 'X'.

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

Add '61' to each side of the equation.
-61 + 61 + X = 74 + 61

Combine like terms: -61 + 61 = 0
0 + X = 74 + 61
X = 74 + 61

Combine like terms: 74 + 61 = 135
X = 135

Simplifying
X = 135

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