4x+21=105

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Solution for 4x+21=105 equation: 


Simplifying
4x + 21 = 105

Reorder the terms:
21 + 4x = 105

Solving
21 + 4x = 105

Solving for variable 'x'.

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

Add '-21' to each side of the equation.
21 + -21 + 4x = 105 + -21

Combine like terms: 21 + -21 = 0
0 + 4x = 105 + -21
4x = 105 + -21

Combine like terms: 105 + -21 = 84
4x = 84

Divide each side by '4'.
x = 21

Simplifying
x = 21

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