x-9+21=1400

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Solution for x-9+21=1400 equation: 


Simplifying
x + -9 + 21 = 1400

Reorder the terms:
-9 + 21 + x = 1400

Combine like terms: -9 + 21 = 12
12 + x = 1400

Solving
12 + x = 1400

Solving for variable 'x'.

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

Add '-12' to each side of the equation.
12 + -12 + x = 1400 + -12

Combine like terms: 12 + -12 = 0
0 + x = 1400 + -12
x = 1400 + -12

Combine like terms: 1400 + -12 = 1388
x = 1388

Simplifying
x = 1388

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