-3(x+8)=x-(x-21)

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Solution for -3(x+8)=x-(x-21) equation:


Simplifying
-3(x + 8) = x + -1(x + -21)

Reorder the terms:
-3(8 + x) = x + -1(x + -21)
(8 * -3 + x * -3) = x + -1(x + -21)
(-24 + -3x) = x + -1(x + -21)

Reorder the terms:
-24 + -3x = x + -1(-21 + x)
-24 + -3x = x + (-21 * -1 + x * -1)
-24 + -3x = x + (21 + -1x)

Reorder the terms:
-24 + -3x = 21 + x + -1x

Combine like terms: x + -1x = 0
-24 + -3x = 21 + 0
-24 + -3x = 21

Solving
-24 + -3x = 21

Solving for variable 'x'.

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

Add '24' to each side of the equation.
-24 + 24 + -3x = 21 + 24

Combine like terms: -24 + 24 = 0
0 + -3x = 21 + 24
-3x = 21 + 24

Combine like terms: 21 + 24 = 45
-3x = 45

Divide each side by '-3'.
x = -15

Simplifying
x = -15

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