X+(3X+5)=21

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Solution for X+(3X+5)=21 equation:


Simplifying
X + (3X + 5) = 21

Reorder the terms:
X + (5 + 3X) = 21

Remove parenthesis around (5 + 3X)
X + 5 + 3X = 21

Reorder the terms:
5 + X + 3X = 21

Combine like terms: X + 3X = 4X
5 + 4X = 21

Solving
5 + 4X = 21

Solving for variable 'X'.

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

Add '-5' to each side of the equation.
5 + -5 + 4X = 21 + -5

Combine like terms: 5 + -5 = 0
0 + 4X = 21 + -5
4X = 21 + -5

Combine like terms: 21 + -5 = 16
4X = 16

Divide each side by '4'.
X = 4

Simplifying
X = 4

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