400-20=x

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Solution for 400-20=x equation:


Simplifying
400 + -20 = x

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

Solving
380 = x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
380 + -1x = x + -1x

Combine like terms: x + -1x = 0
380 + -1x = 0

Add '-380' to each side of the equation.
380 + -380 + -1x = 0 + -380

Combine like terms: 380 + -380 = 0
0 + -1x = 0 + -380
-1x = 0 + -380

Combine like terms: 0 + -380 = -380
-1x = -380

Divide each side by '-1'.
x = 380

Simplifying
x = 380

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