8[x-4]+13=21

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Solution for 8[x-4]+13=21 equation:


Simplifying
8[x + -4] + 13 = 21

Reorder the terms:
8[-4 + x] + 13 = 21
[-4 * 8 + x * 8] + 13 = 21
[-32 + 8x] + 13 = 21

Reorder the terms:
-32 + 13 + 8x = 21

Combine like terms: -32 + 13 = -19
-19 + 8x = 21

Solving
-19 + 8x = 21

Solving for variable 'x'.

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

Add '19' to each side of the equation.
-19 + 19 + 8x = 21 + 19

Combine like terms: -19 + 19 = 0
0 + 8x = 21 + 19
8x = 21 + 19

Combine like terms: 21 + 19 = 40
8x = 40

Divide each side by '8'.
x = 5

Simplifying
x = 5

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