3(2.1+x)=20.4

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Solution for 3(2.1+x)=20.4 equation: 


Simplifying
3(2.1 + x) = 20.4
(2.1 * 3 + x * 3) = 20.4
(6.3 + 3x) = 20.4

Solving
6.3 + 3x = 20.4

Solving for variable 'x'.

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

Add '-6.3' to each side of the equation.
6.3 + -6.3 + 3x = 20.4 + -6.3

Combine like terms: 6.3 + -6.3 = 0.0
0.0 + 3x = 20.4 + -6.3
3x = 20.4 + -6.3

Combine like terms: 20.4 + -6.3 = 14.1
3x = 14.1

Divide each side by '3'.
x = 4.7

Simplifying
x = 4.7

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