12+21=6x+3

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Solution for 12+21=6x+3 equation:


Simplifying
12 + 21 = 6x + 3

Combine like terms: 12 + 21 = 33
33 = 6x + 3

Reorder the terms:
33 = 3 + 6x

Solving
33 = 3 + 6x

Solving for variable 'x'.

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

Add '-6x' to each side of the equation.
33 + -6x = 3 + 6x + -6x

Combine like terms: 6x + -6x = 0
33 + -6x = 3 + 0
33 + -6x = 3

Add '-33' to each side of the equation.
33 + -33 + -6x = 3 + -33

Combine like terms: 33 + -33 = 0
0 + -6x = 3 + -33
-6x = 3 + -33

Combine like terms: 3 + -33 = -30
-6x = -30

Divide each side by '-6'.
x = 5

Simplifying
x = 5

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