3x+7=21

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Solution for 3x+7=21 equation: 


Simplifying
3x + 7 = 21

Reorder the terms:
7 + 3x = 21

Solving
7 + 3x = 21

Solving for variable 'x'.

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

Add '-7' to each side of the equation.
7 + -7 + 3x = 21 + -7

Combine like terms: 7 + -7 = 0
0 + 3x = 21 + -7
3x = 21 + -7

Combine like terms: 21 + -7 = 14
3x = 14

Divide each side by '3'.
x = 4.666666667

Simplifying
x = 4.666666667

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