3(x+4)-8x=21

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


Simplifying
3(x + 4) + -8x = 21

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

Combine like terms: 3x + -8x = -5x
12 + -5x = 21

Solving
12 + -5x = 21

Solving for variable 'x'.

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

Add '-12' to each side of the equation.
12 + -12 + -5x = 21 + -12

Combine like terms: 12 + -12 = 0
0 + -5x = 21 + -12
-5x = 21 + -12

Combine like terms: 21 + -12 = 9
-5x = 9

Divide each side by '-5'.
x = -1.8

Simplifying
x = -1.8

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