21=4(3x+2)+1

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Solution for 21=4(3x+2)+1 equation:


Simplifying
21 = 4(3x + 2) + 1

Reorder the terms:
21 = 4(2 + 3x) + 1
21 = (2 * 4 + 3x * 4) + 1
21 = (8 + 12x) + 1

Reorder the terms:
21 = 8 + 1 + 12x

Combine like terms: 8 + 1 = 9
21 = 9 + 12x

Solving
21 = 9 + 12x

Solving for variable 'x'.

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

Add '-12x' to each side of the equation.
21 + -12x = 9 + 12x + -12x

Combine like terms: 12x + -12x = 0
21 + -12x = 9 + 0
21 + -12x = 9

Add '-21' to each side of the equation.
21 + -21 + -12x = 9 + -21

Combine like terms: 21 + -21 = 0
0 + -12x = 9 + -21
-12x = 9 + -21

Combine like terms: 9 + -21 = -12
-12x = -12

Divide each side by '-12'.
x = 1

Simplifying
x = 1

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