x-2+3x+8=21

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Solution for x-2+3x+8=21 equation:


Simplifying
x + -2 + 3x + 8 = 21

Reorder the terms:
-2 + 8 + x + 3x = 21

Combine like terms: -2 + 8 = 6
6 + x + 3x = 21

Combine like terms: x + 3x = 4x
6 + 4x = 21

Solving
6 + 4x = 21

Solving for variable 'x'.

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

Add '-6' to each side of the equation.
6 + -6 + 4x = 21 + -6

Combine like terms: 6 + -6 = 0
0 + 4x = 21 + -6
4x = 21 + -6

Combine like terms: 21 + -6 = 15
4x = 15

Divide each side by '4'.
x = 3.75

Simplifying
x = 3.75

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