399-21x=75x+15

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Solution for 399-21x=75x+15 equation:


Simplifying
399 + -21x = 75x + 15

Reorder the terms:
399 + -21x = 15 + 75x

Solving
399 + -21x = 15 + 75x

Solving for variable 'x'.

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

Add '-75x' to each side of the equation.
399 + -21x + -75x = 15 + 75x + -75x

Combine like terms: -21x + -75x = -96x
399 + -96x = 15 + 75x + -75x

Combine like terms: 75x + -75x = 0
399 + -96x = 15 + 0
399 + -96x = 15

Add '-399' to each side of the equation.
399 + -399 + -96x = 15 + -399

Combine like terms: 399 + -399 = 0
0 + -96x = 15 + -399
-96x = 15 + -399

Combine like terms: 15 + -399 = -384
-96x = -384

Divide each side by '-96'.
x = 4

Simplifying
x = 4

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