21+x=-3(x+1)

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Solution for 21+x=-3(x+1) equation:


Simplifying
21 + x = -3(x + 1)

Reorder the terms:
21 + x = -3(1 + x)
21 + x = (1 * -3 + x * -3)
21 + x = (-3 + -3x)

Solving
21 + x = -3 + -3x

Solving for variable 'x'.

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

Add '3x' to each side of the equation.
21 + x + 3x = -3 + -3x + 3x

Combine like terms: x + 3x = 4x
21 + 4x = -3 + -3x + 3x

Combine like terms: -3x + 3x = 0
21 + 4x = -3 + 0
21 + 4x = -3

Add '-21' to each side of the equation.
21 + -21 + 4x = -3 + -21

Combine like terms: 21 + -21 = 0
0 + 4x = -3 + -21
4x = -3 + -21

Combine like terms: -3 + -21 = -24
4x = -24

Divide each side by '4'.
x = -6

Simplifying
x = -6

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