3(x+1)=21-3x

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Solution for 3(x+1)=21-3x equation:


Simplifying
3(x + 1) = 21 + -3x

Reorder the terms:
3(1 + x) = 21 + -3x
(1 * 3 + x * 3) = 21 + -3x
(3 + 3x) = 21 + -3x

Solving
3 + 3x = 21 + -3x

Solving for variable 'x'.

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

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

Combine like terms: 3x + 3x = 6x
3 + 6x = 21 + -3x + 3x

Combine like terms: -3x + 3x = 0
3 + 6x = 21 + 0
3 + 6x = 21

Add '-3' to each side of the equation.
3 + -3 + 6x = 21 + -3

Combine like terms: 3 + -3 = 0
0 + 6x = 21 + -3
6x = 21 + -3

Combine like terms: 21 + -3 = 18
6x = 18

Divide each side by '6'.
x = 3

Simplifying
x = 3

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