9x-(4x-6)=21

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Solution for 9x-(4x-6)=21 equation:


Simplifying
9x + -1(4x + -6) = 21

Reorder the terms:
9x + -1(-6 + 4x) = 21
9x + (-6 * -1 + 4x * -1) = 21
9x + (6 + -4x) = 21

Reorder the terms:
6 + 9x + -4x = 21

Combine like terms: 9x + -4x = 5x
6 + 5x = 21

Solving
6 + 5x = 21

Solving for variable 'x'.

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

Add '-6' to each side of the equation.
6 + -6 + 5x = 21 + -6

Combine like terms: 6 + -6 = 0
0 + 5x = 21 + -6
5x = 21 + -6

Combine like terms: 21 + -6 = 15
5x = 15

Divide each side by '5'.
x = 3

Simplifying
x = 3

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