7x-4x-21=28

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Solution for 7x-4x-21=28 equation:


Simplifying
7x + -4x + -21 = 28

Reorder the terms:
-21 + 7x + -4x = 28

Combine like terms: 7x + -4x = 3x
-21 + 3x = 28

Solving
-21 + 3x = 28

Solving for variable 'x'.

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

Add '21' to each side of the equation.
-21 + 21 + 3x = 28 + 21

Combine like terms: -21 + 21 = 0
0 + 3x = 28 + 21
3x = 28 + 21

Combine like terms: 28 + 21 = 49
3x = 49

Divide each side by '3'.
x = 16.33333333

Simplifying
x = 16.33333333

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