1+3x=21

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Solution for 1+3x=21 equation: 


Simplifying
1 + 3x = 21

Solving
1 + 3x = 21

Solving for variable 'x'.

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

Add '-1' to each side of the equation.
1 + -1 + 3x = 21 + -1

Combine like terms: 1 + -1 = 0
0 + 3x = 21 + -1
3x = 21 + -1

Combine like terms: 21 + -1 = 20
3x = 20

Divide each side by '3'.
x = 6.666666667

Simplifying
x = 6.666666667

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