3x+21-8x+4=12

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Solution for 3x+21-8x+4=12 equation:


Simplifying
3x + 21 + -8x + 4 = 12

Reorder the terms:
21 + 4 + 3x + -8x = 12

Combine like terms: 21 + 4 = 25
25 + 3x + -8x = 12

Combine like terms: 3x + -8x = -5x
25 + -5x = 12

Solving
25 + -5x = 12

Solving for variable 'x'.

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

Add '-25' to each side of the equation.
25 + -25 + -5x = 12 + -25

Combine like terms: 25 + -25 = 0
0 + -5x = 12 + -25
-5x = 12 + -25

Combine like terms: 12 + -25 = -13
-5x = -13

Divide each side by '-5'.
x = 2.6

Simplifying
x = 2.6

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