380+x=400

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Solution for 380+x=400 equation: 


Simplifying
380 + x = 400

Solving
380 + x = 400

Solving for variable 'x'.

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

Add '-380' to each side of the equation.
380 + -380 + x = 400 + -380

Combine like terms: 380 + -380 = 0
0 + x = 400 + -380
x = 400 + -380

Combine like terms: 400 + -380 = 20
x = 20

Simplifying
x = 20

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