-3x+(-x-1)=9

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Solution for -3x+(-x-1)=9 equation:


Simplifying
-3x + (-1x + -1) = 9

Reorder the terms:
-3x + (-1 + -1x) = 9

Remove parenthesis around (-1 + -1x)
-3x + -1 + -1x = 9

Reorder the terms:
-1 + -3x + -1x = 9

Combine like terms: -3x + -1x = -4x
-1 + -4x = 9

Solving
-1 + -4x = 9

Solving for variable 'x'.

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

Add '1' to each side of the equation.
-1 + 1 + -4x = 9 + 1

Combine like terms: -1 + 1 = 0
0 + -4x = 9 + 1
-4x = 9 + 1

Combine like terms: 9 + 1 = 10
-4x = 10

Divide each side by '-4'.
x = -2.5

Simplifying
x = -2.5

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