4x+8=9x+21

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Solution for 4x+8=9x+21 equation:


Simplifying
4x + 8 = 9x + 21

Reorder the terms:
8 + 4x = 9x + 21

Reorder the terms:
8 + 4x = 21 + 9x

Solving
8 + 4x = 21 + 9x

Solving for variable 'x'.

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

Add '-9x' to each side of the equation.
8 + 4x + -9x = 21 + 9x + -9x

Combine like terms: 4x + -9x = -5x
8 + -5x = 21 + 9x + -9x

Combine like terms: 9x + -9x = 0
8 + -5x = 21 + 0
8 + -5x = 21

Add '-8' to each side of the equation.
8 + -8 + -5x = 21 + -8

Combine like terms: 8 + -8 = 0
0 + -5x = 21 + -8
-5x = 21 + -8

Combine like terms: 21 + -8 = 13
-5x = 13

Divide each side by '-5'.
x = -2.6

Simplifying
x = -2.6

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