3x-4+2x=21

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Solution for 3x-4+2x=21 equation: 


Simplifying
3x + -4 + 2x = 21

Reorder the terms:
-4 + 3x + 2x = 21

Combine like terms: 3x + 2x = 5x
-4 + 5x = 21

Solving
-4 + 5x = 21

Solving for variable 'x'.

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

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

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

Combine like terms: 21 + 4 = 25
5x = 25

Divide each side by '5'.
x = 5

Simplifying
x = 5

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