15x-9=8x+21

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Solution for 15x-9=8x+21 equation:


Simplifying
15x + -9 = 8x + 21

Reorder the terms:
-9 + 15x = 8x + 21

Reorder the terms:
-9 + 15x = 21 + 8x

Solving
-9 + 15x = 21 + 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.
-9 + 15x + -8x = 21 + 8x + -8x

Combine like terms: 15x + -8x = 7x
-9 + 7x = 21 + 8x + -8x

Combine like terms: 8x + -8x = 0
-9 + 7x = 21 + 0
-9 + 7x = 21

Add '9' to each side of the equation.
-9 + 9 + 7x = 21 + 9

Combine like terms: -9 + 9 = 0
0 + 7x = 21 + 9
7x = 21 + 9

Combine like terms: 21 + 9 = 30
7x = 30

Divide each side by '7'.
x = 4.285714286

Simplifying
x = 4.285714286

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