-7-7(-3x-13)=-21

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Solution for -7-7(-3x-13)=-21 equation:


Simplifying
-7 + -7(-3x + -13) = -21

Reorder the terms:
-7 + -7(-13 + -3x) = -21
-7 + (-13 * -7 + -3x * -7) = -21
-7 + (91 + 21x) = -21

Combine like terms: -7 + 91 = 84
84 + 21x = -21

Solving
84 + 21x = -21

Solving for variable 'x'.

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

Add '-84' to each side of the equation.
84 + -84 + 21x = -21 + -84

Combine like terms: 84 + -84 = 0
0 + 21x = -21 + -84
21x = -21 + -84

Combine like terms: -21 + -84 = -105
21x = -105

Divide each side by '21'.
x = -5

Simplifying
x = -5

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