28-7x=-21

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Solution for 28-7x=-21 equation: 


Simplifying
28 + -7x = -21

Solving
28 + -7x = -21

Solving for variable 'x'.

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

Add '-28' to each side of the equation.
28 + -28 + -7x = -21 + -28

Combine like terms: 28 + -28 = 0
0 + -7x = -21 + -28
-7x = -21 + -28

Combine like terms: -21 + -28 = -49
-7x = -49

Divide each side by '-7'.
x = 7

Simplifying
x = 7

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