-3(7+X)=9

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Solution for -3(7+X)=9 equation: 


Simplifying
-3(7 + X) = 9
(7 * -3 + X * -3) = 9
(-21 + -3X) = 9

Solving
-21 + -3X = 9

Solving for variable 'X'.

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

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

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

Combine like terms: 9 + 21 = 30
-3X = 30

Divide each side by '-3'.
X = -10

Simplifying
X = -10

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