4x-6-8x-9=21

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Solution for 4x-6-8x-9=21 equation:


Simplifying
4x + -6 + -8x + -9 = 21

Reorder the terms:
-6 + -9 + 4x + -8x = 21

Combine like terms: -6 + -9 = -15
-15 + 4x + -8x = 21

Combine like terms: 4x + -8x = -4x
-15 + -4x = 21

Solving
-15 + -4x = 21

Solving for variable 'x'.

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

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

Combine like terms: -15 + 15 = 0
0 + -4x = 21 + 15
-4x = 21 + 15

Combine like terms: 21 + 15 = 36
-4x = 36

Divide each side by '-4'.
x = -9

Simplifying
x = -9

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