18x-(9x+3)=21

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Solution for 18x-(9x+3)=21 equation:


Simplifying
18x + -1(9x + 3) = 21

Reorder the terms:
18x + -1(3 + 9x) = 21
18x + (3 * -1 + 9x * -1) = 21
18x + (-3 + -9x) = 21

Reorder the terms:
-3 + 18x + -9x = 21

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

Solving
-3 + 9x = 21

Solving for variable 'x'.

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

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

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

Combine like terms: 21 + 3 = 24
9x = 24

Divide each side by '9'.
x = 2.666666667

Simplifying
x = 2.666666667

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