4x+9=21x-15

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Solution for 4x+9=21x-15 equation:


Simplifying
4x + 9 = 21x + -15

Reorder the terms:
9 + 4x = 21x + -15

Reorder the terms:
9 + 4x = -15 + 21x

Solving
9 + 4x = -15 + 21x

Solving for variable 'x'.

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

Add '-21x' to each side of the equation.
9 + 4x + -21x = -15 + 21x + -21x

Combine like terms: 4x + -21x = -17x
9 + -17x = -15 + 21x + -21x

Combine like terms: 21x + -21x = 0
9 + -17x = -15 + 0
9 + -17x = -15

Add '-9' to each side of the equation.
9 + -9 + -17x = -15 + -9

Combine like terms: 9 + -9 = 0
0 + -17x = -15 + -9
-17x = -15 + -9

Combine like terms: -15 + -9 = -24
-17x = -24

Divide each side by '-17'.
x = 1.411764706

Simplifying
x = 1.411764706

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