7x-3x-4=-1+21

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Solution for 7x-3x-4=-1+21 equation:


Simplifying
7x + -3x + -4 = -1 + 21

Reorder the terms:
-4 + 7x + -3x = -1 + 21

Combine like terms: 7x + -3x = 4x
-4 + 4x = -1 + 21

Combine like terms: -1 + 21 = 20
-4 + 4x = 20

Solving
-4 + 4x = 20

Solving for variable 'x'.

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

Add '4' to each side of the equation.
-4 + 4 + 4x = 20 + 4

Combine like terms: -4 + 4 = 0
0 + 4x = 20 + 4
4x = 20 + 4

Combine like terms: 20 + 4 = 24
4x = 24

Divide each side by '4'.
x = 6

Simplifying
x = 6

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