3*(6+x)=72

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Solution for 3*(6+x)=72 equation: 


Simplifying
3(6 + x) = 72
(6 * 3 + x * 3) = 72
(18 + 3x) = 72

Solving
18 + 3x = 72

Solving for variable 'x'.

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

Add '-18' to each side of the equation.
18 + -18 + 3x = 72 + -18

Combine like terms: 18 + -18 = 0
0 + 3x = 72 + -18
3x = 72 + -18

Combine like terms: 72 + -18 = 54
3x = 54

Divide each side by '3'.
x = 18

Simplifying
x = 18

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