-21=7-4x

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Solution for -21=7-4x equation:


Simplifying
-21 = 7 + -4x

Solving
-21 = 7 + -4x

Solving for variable 'x'.

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

Add '4x' to each side of the equation.
-21 + 4x = 7 + -4x + 4x

Combine like terms: -4x + 4x = 0
-21 + 4x = 7 + 0
-21 + 4x = 7

Add '21' to each side of the equation.
-21 + 21 + 4x = 7 + 21

Combine like terms: -21 + 21 = 0
0 + 4x = 7 + 21
4x = 7 + 21

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

Divide each side by '4'.
x = 7

Simplifying
x = 7

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