7x-3x-5=21

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Solution for 7x-3x-5=21 equation:


Simplifying
7x + -3x + -5 = 21

Reorder the terms:
-5 + 7x + -3x = 21

Combine like terms: 7x + -3x = 4x
-5 + 4x = 21

Solving
-5 + 4x = 21

Solving for variable 'x'.

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

Add '5' to each side of the equation.
-5 + 5 + 4x = 21 + 5

Combine like terms: -5 + 5 = 0
0 + 4x = 21 + 5
4x = 21 + 5

Combine like terms: 21 + 5 = 26
4x = 26

Divide each side by '4'.
x = 6.5

Simplifying
x = 6.5

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