.5s=4s-21

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Solution for .5s=4s-21 equation: 


Simplifying
0.5s = 4s + -21

Reorder the terms:
0.5s = -21 + 4s

Solving
0.5s = -21 + 4s

Solving for variable 's'.

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

Add '-4s' to each side of the equation.
0.5s + -4s = -21 + 4s + -4s

Combine like terms: 0.5s + -4s = -3.5s
-3.5s = -21 + 4s + -4s

Combine like terms: 4s + -4s = 0
-3.5s = -21 + 0
-3.5s = -21

Divide each side by '-3.5'.
s = 6

Simplifying
s = 6

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