x+30=21

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Solution for x+30=21 equation: 


Simplifying
x + 30 = 21

Reorder the terms:
30 + x = 21

Solving
30 + x = 21

Solving for variable 'x'.

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

Add '-30' to each side of the equation.
30 + -30 + x = 21 + -30

Combine like terms: 30 + -30 = 0
0 + x = 21 + -30
x = 21 + -30

Combine like terms: 21 + -30 = -9
x = -9

Simplifying
x = -9

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