7=21-x

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Solution for 7=21-x equation: 


Simplifying
7 = 21 + -1x

Solving
7 = 21 + -1x

Solving for variable 'x'.

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

Add 'x' to each side of the equation.
7 + x = 21 + -1x + x

Combine like terms: -1x + x = 0
7 + x = 21 + 0
7 + x = 21

Add '-7' to each side of the equation.
7 + -7 + x = 21 + -7

Combine like terms: 7 + -7 = 0
0 + x = 21 + -7
x = 21 + -7

Combine like terms: 21 + -7 = 14
x = 14

Simplifying
x = 14

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