15x+21-x=10x-9

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Solution for 15x+21-x=10x-9 equation:


Simplifying
15x + 21 + -1x = 10x + -9

Reorder the terms:
21 + 15x + -1x = 10x + -9

Combine like terms: 15x + -1x = 14x
21 + 14x = 10x + -9

Reorder the terms:
21 + 14x = -9 + 10x

Solving
21 + 14x = -9 + 10x

Solving for variable 'x'.

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

Add '-10x' to each side of the equation.
21 + 14x + -10x = -9 + 10x + -10x

Combine like terms: 14x + -10x = 4x
21 + 4x = -9 + 10x + -10x

Combine like terms: 10x + -10x = 0
21 + 4x = -9 + 0
21 + 4x = -9

Add '-21' to each side of the equation.
21 + -21 + 4x = -9 + -21

Combine like terms: 21 + -21 = 0
0 + 4x = -9 + -21
4x = -9 + -21

Combine like terms: -9 + -21 = -30
4x = -30

Divide each side by '4'.
x = -7.5

Simplifying
x = -7.5

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