21-x+36=54

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Solution for 21-x+36=54 equation:


Simplifying
21 + -1x + 36 = 54

Reorder the terms:
21 + 36 + -1x = 54

Combine like terms: 21 + 36 = 57
57 + -1x = 54

Solving
57 + -1x = 54

Solving for variable 'x'.

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

Add '-57' to each side of the equation.
57 + -57 + -1x = 54 + -57

Combine like terms: 57 + -57 = 0
0 + -1x = 54 + -57
-1x = 54 + -57

Combine like terms: 54 + -57 = -3
-1x = -3

Divide each side by '-1'.
x = 3

Simplifying
x = 3

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