21=2x+3(x+4)

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


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

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

Reorder the terms:
21 = 12 + 2x + 3x

Combine like terms: 2x + 3x = 5x
21 = 12 + 5x

Solving
21 = 12 + 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 = 12 + 5x + -5x

Combine like terms: 5x + -5x = 0
21 + -5x = 12 + 0
21 + -5x = 12

Add '-21' to each side of the equation.
21 + -21 + -5x = 12 + -21

Combine like terms: 21 + -21 = 0
0 + -5x = 12 + -21
-5x = 12 + -21

Combine like terms: 12 + -21 = -9
-5x = -9

Divide each side by '-5'.
x = 1.8

Simplifying
x = 1.8

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