21x+9-3x=

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Solution for 21x+9-3x= equation:


Simplifying
21x + 9 + -3x = 0

Reorder the terms:
9 + 21x + -3x = 0

Combine like terms: 21x + -3x = 18x
9 + 18x = 0

Solving
9 + 18x = 0

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 + 18x = 0 + -9

Combine like terms: 9 + -9 = 0
0 + 18x = 0 + -9
18x = 0 + -9

Combine like terms: 0 + -9 = -9
18x = -9

Divide each side by '18'.
x = -0.5

Simplifying
x = -0.5

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