3(15+x)=81

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Solution for 3(15+x)=81 equation: 


Simplifying
3(15 + x) = 81
(15 * 3 + x * 3) = 81
(45 + 3x) = 81

Solving
45 + 3x = 81

Solving for variable 'x'.

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

Add '-45' to each side of the equation.
45 + -45 + 3x = 81 + -45

Combine like terms: 45 + -45 = 0
0 + 3x = 81 + -45
3x = 81 + -45

Combine like terms: 81 + -45 = 36
3x = 36

Divide each side by '3'.
x = 12

Simplifying
x = 12

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