-21=-9+4(x-8)

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Solution for -21=-9+4(x-8) equation:


Simplifying
-21 = -9 + 4(x + -8)

Reorder the terms:
-21 = -9 + 4(-8 + x)
-21 = -9 + (-8 * 4 + x * 4)
-21 = -9 + (-32 + 4x)

Combine like terms: -9 + -32 = -41
-21 = -41 + 4x

Solving
-21 = -41 + 4x

Solving for variable 'x'.

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

Add '-4x' to each side of the equation.
-21 + -4x = -41 + 4x + -4x

Combine like terms: 4x + -4x = 0
-21 + -4x = -41 + 0
-21 + -4x = -41

Add '21' to each side of the equation.
-21 + 21 + -4x = -41 + 21

Combine like terms: -21 + 21 = 0
0 + -4x = -41 + 21
-4x = -41 + 21

Combine like terms: -41 + 21 = -20
-4x = -20

Divide each side by '-4'.
x = 5

Simplifying
x = 5

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