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

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


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

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

Reorder the terms:
91 + -7x + 21x = -21

Combine like terms: -7x + 21x = 14x
91 + 14x = -21

Solving
91 + 14x = -21

Solving for variable 'x'.

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

Add '-91' to each side of the equation.
91 + -91 + 14x = -21 + -91

Combine like terms: 91 + -91 = 0
0 + 14x = -21 + -91
14x = -21 + -91

Combine like terms: -21 + -91 = -112
14x = -112

Divide each side by '14'.
x = -8

Simplifying
x = -8

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