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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