21=7x+6-4

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Solution for 21=7x+6-4 equation:


Simplifying
21 = 7x + 6 + -4

Reorder the terms:
21 = 6 + -4 + 7x

Combine like terms: 6 + -4 = 2
21 = 2 + 7x

Solving
21 = 2 + 7x

Solving for variable 'x'.

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

Add '-7x' to each side of the equation.
21 + -7x = 2 + 7x + -7x

Combine like terms: 7x + -7x = 0
21 + -7x = 2 + 0
21 + -7x = 2

Add '-21' to each side of the equation.
21 + -21 + -7x = 2 + -21

Combine like terms: 21 + -21 = 0
0 + -7x = 2 + -21
-7x = 2 + -21

Combine like terms: 2 + -21 = -19
-7x = -19

Divide each side by '-7'.
x = 2.714285714

Simplifying
x = 2.714285714

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