21=5x+5+1

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Solution for 21=5x+5+1 equation:


Simplifying
21 = 5x + 5 + 1

Reorder the terms:
21 = 5 + 1 + 5x

Combine like terms: 5 + 1 = 6
21 = 6 + 5x

Solving
21 = 6 + 5x

Solving for variable 'x'.

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

Add '-5x' to each side of the equation.
21 + -5x = 6 + 5x + -5x

Combine like terms: 5x + -5x = 0
21 + -5x = 6 + 0
21 + -5x = 6

Add '-21' to each side of the equation.
21 + -21 + -5x = 6 + -21

Combine like terms: 21 + -21 = 0
0 + -5x = 6 + -21
-5x = 6 + -21

Combine like terms: 6 + -21 = -15
-5x = -15

Divide each side by '-5'.
x = 3

Simplifying
x = 3

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