3X+4.2=21

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Solution for 3X+4.2=21 equation: 


Simplifying
3X + 4.2 = 21

Reorder the terms:
4.2 + 3X = 21

Solving
4.2 + 3X = 21

Solving for variable 'X'.

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

Add '-4.2' to each side of the equation.
4.2 + -4.2 + 3X = 21 + -4.2

Combine like terms: 4.2 + -4.2 = 0.0
0.0 + 3X = 21 + -4.2
3X = 21 + -4.2

Combine like terms: 21 + -4.2 = 16.8
3X = 16.8

Divide each side by '3'.
X = 5.6

Simplifying
X = 5.6

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