3(20+x)=81

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Solution for 3(20+x)=81 equation: 


Simplifying
3(20 + x) = 81
(20 * 3 + x * 3) = 81
(60 + 3x) = 81

Solving
60 + 3x = 81

Solving for variable 'x'.

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

Add '-60' to each side of the equation.
60 + -60 + 3x = 81 + -60

Combine like terms: 60 + -60 = 0
0 + 3x = 81 + -60
3x = 81 + -60

Combine like terms: 81 + -60 = 21
3x = 21

Divide each side by '3'.
x = 7

Simplifying
x = 7

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