[9+4x]=-1

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Solution for [9+4x]=-1 equation: 


Simplifying
[9 + 4x] = -1

Remove brackets around [9 + 4x]
9 + 4x = -1

Solving
9 + 4x = -1

Solving for variable 'x'.

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

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

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

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

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

Simplifying
x = -2.5

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