-3x-(x+5)=21

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Solution for -3x-(x+5)=21 equation:


Simplifying
-3x + -1(x + 5) = 21

Reorder the terms:
-3x + -1(5 + x) = 21
-3x + (5 * -1 + x * -1) = 21
-3x + (-5 + -1x) = 21

Reorder the terms:
-5 + -3x + -1x = 21

Combine like terms: -3x + -1x = -4x
-5 + -4x = 21

Solving
-5 + -4x = 21

Solving for variable 'x'.

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

Add '5' to each side of the equation.
-5 + 5 + -4x = 21 + 5

Combine like terms: -5 + 5 = 0
0 + -4x = 21 + 5
-4x = 21 + 5

Combine like terms: 21 + 5 = 26
-4x = 26

Divide each side by '-4'.
x = -6.5

Simplifying
x = -6.5

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