3(x+3)+x=2x+21

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Solution for 3(x+3)+x=2x+21 equation:


Simplifying
3(x + 3) + x = 2x + 21

Reorder the terms:
3(3 + x) + x = 2x + 21
(3 * 3 + x * 3) + x = 2x + 21
(9 + 3x) + x = 2x + 21

Combine like terms: 3x + x = 4x
9 + 4x = 2x + 21

Reorder the terms:
9 + 4x = 21 + 2x

Solving
9 + 4x = 21 + 2x

Solving for variable 'x'.

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

Add '-2x' to each side of the equation.
9 + 4x + -2x = 21 + 2x + -2x

Combine like terms: 4x + -2x = 2x
9 + 2x = 21 + 2x + -2x

Combine like terms: 2x + -2x = 0
9 + 2x = 21 + 0
9 + 2x = 21

Add '-9' to each side of the equation.
9 + -9 + 2x = 21 + -9

Combine like terms: 9 + -9 = 0
0 + 2x = 21 + -9
2x = 21 + -9

Combine like terms: 21 + -9 = 12
2x = 12

Divide each side by '2'.
x = 6

Simplifying
x = 6

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