7(7-x)=21

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Solution for 7(7-x)=21 equation: 


Simplifying
7(7 + -1x) = 21
(7 * 7 + -1x * 7) = 21
(49 + -7x) = 21

Solving
49 + -7x = 21

Solving for variable 'x'.

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

Add '-49' to each side of the equation.
49 + -49 + -7x = 21 + -49

Combine like terms: 49 + -49 = 0
0 + -7x = 21 + -49
-7x = 21 + -49

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

Divide each side by '-7'.
x = 4

Simplifying
x = 4

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