3(10+x)=66

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Solution for 3(10+x)=66 equation: 


Simplifying
3(10 + x) = 66
(10 * 3 + x * 3) = 66
(30 + 3x) = 66

Solving
30 + 3x = 66

Solving for variable 'x'.

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

Add '-30' to each side of the equation.
30 + -30 + 3x = 66 + -30

Combine like terms: 30 + -30 = 0
0 + 3x = 66 + -30
3x = 66 + -30

Combine like terms: 66 + -30 = 36
3x = 36

Divide each side by '3'.
x = 12

Simplifying
x = 12

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