X+3+2x=21

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Solution for X+3+2x=21 equation:


Simplifying
X + 3 + 2x = 21

Reorder the terms:
3 + X + 2x = 21

Solving
3 + X + 2x = 21

Solving for variable 'X'.

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

Add '-3' to each side of the equation.
3 + X + -3 + 2x = 21 + -3

Reorder the terms:
3 + -3 + X + 2x = 21 + -3

Combine like terms: 3 + -3 = 0
0 + X + 2x = 21 + -3
X + 2x = 21 + -3

Combine like terms: 21 + -3 = 18
X + 2x = 18

Add '-2x' to each side of the equation.
X + 2x + -2x = 18 + -2x

Combine like terms: 2x + -2x = 0
X + 0 = 18 + -2x
X = 18 + -2x

Simplifying
X = 18 + -2x

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