6X+18=3X-21

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Solution for 6X+18=3X-21 equation:


Simplifying
6X + 18 = 3X + -21

Reorder the terms:
18 + 6X = 3X + -21

Reorder the terms:
18 + 6X = -21 + 3X

Solving
18 + 6X = -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.
18 + 6X + -3X = -21 + 3X + -3X

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

Combine like terms: 3X + -3X = 0
18 + 3X = -21 + 0
18 + 3X = -21

Add '-18' to each side of the equation.
18 + -18 + 3X = -21 + -18

Combine like terms: 18 + -18 = 0
0 + 3X = -21 + -18
3X = -21 + -18

Combine like terms: -21 + -18 = -39
3X = -39

Divide each side by '3'.
X = -13

Simplifying
X = -13

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