9x+3x+99=-9x+57

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Solution for 9x+3x+99=-9x+57 equation: 


Simplifying
9x + 3x + 99 = -9x + 57

Reorder the terms:
99 + 9x + 3x = -9x + 57

Combine like terms: 9x + 3x = 12x
99 + 12x = -9x + 57

Reorder the terms:
99 + 12x = 57 + -9x

Solving
99 + 12x = 57 + -9x

Solving for variable 'x'.

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

Add '9x' to each side of the equation.
99 + 12x + 9x = 57 + -9x + 9x

Combine like terms: 12x + 9x = 21x
99 + 21x = 57 + -9x + 9x

Combine like terms: -9x + 9x = 0
99 + 21x = 57 + 0
99 + 21x = 57

Add '-99' to each side of the equation.
99 + -99 + 21x = 57 + -99

Combine like terms: 99 + -99 = 0
0 + 21x = 57 + -99
21x = 57 + -99

Combine like terms: 57 + -99 = -42
21x = -42

Divide each side by '21'.
x = -2

Simplifying
x = -2

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