15X+21=42+8X

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Solution for 15X+21=42+8X equation:


Simplifying
15X + 21 = 42 + 8X

Reorder the terms:
21 + 15X = 42 + 8X

Solving
21 + 15X = 42 + 8X

Solving for variable 'X'.

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

Add '-8X' to each side of the equation.
21 + 15X + -8X = 42 + 8X + -8X

Combine like terms: 15X + -8X = 7X
21 + 7X = 42 + 8X + -8X

Combine like terms: 8X + -8X = 0
21 + 7X = 42 + 0
21 + 7X = 42

Add '-21' to each side of the equation.
21 + -21 + 7X = 42 + -21

Combine like terms: 21 + -21 = 0
0 + 7X = 42 + -21
7X = 42 + -21

Combine like terms: 42 + -21 = 21
7X = 21

Divide each side by '7'.
X = 3

Simplifying
X = 3

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