3x+1+8=21

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Solution for 3x+1+8=21 equation: 


Simplifying
3x + 1 + 8 = 21

Reorder the terms:
1 + 8 + 3x = 21

Combine like terms: 1 + 8 = 9
9 + 3x = 21

Solving
9 + 3x = 21

Solving for variable 'x'.

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

Add '-9' to each side of the equation.
9 + -9 + 3x = 21 + -9

Combine like terms: 9 + -9 = 0
0 + 3x = 21 + -9
3x = 21 + -9

Combine like terms: 21 + -9 = 12
3x = 12

Divide each side by '3'.
x = 4

Simplifying
x = 4

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