-(x+3)=18

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


Simplifying
-1(x + 3) = 18

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

Solving
-3 + -1x = 18

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 + -1x = 18 + 3

Combine like terms: -3 + 3 = 0
0 + -1x = 18 + 3
-1x = 18 + 3

Combine like terms: 18 + 3 = 21
-1x = 21

Divide each side by '-1'.
x = -21

Simplifying
x = -21

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