21=37-4x

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Solution for 21=37-4x equation: 


Simplifying
21 = 37 + -4x

Solving
21 = 37 + -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 = 37 + -4x + 4x

Combine like terms: -4x + 4x = 0
21 + 4x = 37 + 0
21 + 4x = 37

Add '-21' to each side of the equation.
21 + -21 + 4x = 37 + -21

Combine like terms: 21 + -21 = 0
0 + 4x = 37 + -21
4x = 37 + -21

Combine like terms: 37 + -21 = 16
4x = 16

Divide each side by '4'.
x = 4

Simplifying
x = 4

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