21X-3=15X+15

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Solution for 21X-3=15X+15 equation:


Simplifying
21X + -3 = 15X + 15

Reorder the terms:
-3 + 21X = 15X + 15

Reorder the terms:
-3 + 21X = 15 + 15X

Solving
-3 + 21X = 15 + 15X

Solving for variable 'X'.

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

Add '-15X' to each side of the equation.
-3 + 21X + -15X = 15 + 15X + -15X

Combine like terms: 21X + -15X = 6X
-3 + 6X = 15 + 15X + -15X

Combine like terms: 15X + -15X = 0
-3 + 6X = 15 + 0
-3 + 6X = 15

Add '3' to each side of the equation.
-3 + 3 + 6X = 15 + 3

Combine like terms: -3 + 3 = 0
0 + 6X = 15 + 3
6X = 15 + 3

Combine like terms: 15 + 3 = 18
6X = 18

Divide each side by '6'.
X = 3

Simplifying
X = 3

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