-9-3x=21-4x

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Solution for -9-3x=21-4x equation:


Simplifying
-9 + -3x = 21 + -4x

Solving
-9 + -3x = 21 + -4x

Solving for variable 'x'.

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

Add '4x' to each side of the equation.
-9 + -3x + 4x = 21 + -4x + 4x

Combine like terms: -3x + 4x = 1x
-9 + 1x = 21 + -4x + 4x

Combine like terms: -4x + 4x = 0
-9 + 1x = 21 + 0
-9 + 1x = 21

Add '9' to each side of the equation.
-9 + 9 + 1x = 21 + 9

Combine like terms: -9 + 9 = 0
0 + 1x = 21 + 9
1x = 21 + 9

Combine like terms: 21 + 9 = 30
1x = 30

Divide each side by '1'.
x = 30

Simplifying
x = 30

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