2(x+2x)-3=21

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


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

Combine like terms: x + 2x = 3x
2(3x) + -3 = 21

Remove parenthesis around (3x)
2 * 3x + -3 = 21

Multiply 2 * 3
6x + -3 = 21

Reorder the terms:
-3 + 6x = 21

Solving
-3 + 6x = 21

Solving for variable 'x'.

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

Add '3' to each side of the equation.
-3 + 3 + 6x = 21 + 3

Combine like terms: -3 + 3 = 0
0 + 6x = 21 + 3
6x = 21 + 3

Combine like terms: 21 + 3 = 24
6x = 24

Divide each side by '6'.
x = 4

Simplifying
x = 4

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