-7[x+2]=21

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Solution for -7[x+2]=21 equation:


Simplifying
-7[x + 2] = 21

Reorder the terms:
-7[2 + x] = 21
[2 * -7 + x * -7] = 21
[-14 + -7x] = 21

Solving
-14 + -7x = 21

Solving for variable 'x'.

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

Add '14' to each side of the equation.
-14 + 14 + -7x = 21 + 14

Combine like terms: -14 + 14 = 0
0 + -7x = 21 + 14
-7x = 21 + 14

Combine like terms: 21 + 14 = 35
-7x = 35

Divide each side by '-7'.
x = -5

Simplifying
x = -5

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