9(x-1)-4x=21

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Solution for 9(x-1)-4x=21 equation:


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

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

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

Solving
-9 + 5x = 21

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 + 5x = 21 + 9

Combine like terms: -9 + 9 = 0
0 + 5x = 21 + 9
5x = 21 + 9

Combine like terms: 21 + 9 = 30
5x = 30

Divide each side by '5'.
x = 6

Simplifying
x = 6

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