21+3x=3x+I

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Solution for 21+3x=3x+I equation:


Simplifying
21 + 3x = 3x + I

Reorder the terms:
21 + 3x = I + 3x

Add '-3x' to each side of the equation.
21 + 3x + -3x = I + 3x + -3x

Combine like terms: 3x + -3x = 0
21 + 0 = I + 3x + -3x
21 = I + 3x + -3x

Combine like terms: 3x + -3x = 0
21 = I + 0
21 = I

Solving
21 = I

Solving for variable 'I'.

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

Add '-1I' to each side of the equation.
21 + -1I = I + -1I

Combine like terms: I + -1I = 0
21 + -1I = 0

Add '-21' to each side of the equation.
21 + -21 + -1I = 0 + -21

Combine like terms: 21 + -21 = 0
0 + -1I = 0 + -21
-1I = 0 + -21

Combine like terms: 0 + -21 = -21
-1I = -21

Divide each side by '-1'.
I = 21

Simplifying
I = 21

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