7+x=28

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Solution for 7+x=28 equation: 


Simplifying
7 + x = 28

Solving
7 + x = 28

Solving for variable 'x'.

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

Add '-7' to each side of the equation.
7 + -7 + x = 28 + -7

Combine like terms: 7 + -7 = 0
0 + x = 28 + -7
x = 28 + -7

Combine like terms: 28 + -7 = 21
x = 21

Simplifying
x = 21

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