21x+15=6x

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Solution for 21x+15=6x equation:


Simplifying
21x + 15 = 6x

Reorder the terms:
15 + 21x = 6x

Solving
15 + 21x = 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.
15 + 21x + -6x = 6x + -6x

Combine like terms: 21x + -6x = 15x
15 + 15x = 6x + -6x

Combine like terms: 6x + -6x = 0
15 + 15x = 0

Add '-15' to each side of the equation.
15 + -15 + 15x = 0 + -15

Combine like terms: 15 + -15 = 0
0 + 15x = 0 + -15
15x = 0 + -15

Combine like terms: 0 + -15 = -15
15x = -15

Divide each side by '15'.
x = -1

Simplifying
x = -1

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