320=21s-13s

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Solution for 320=21s-13s equation:


Simplifying
320 = 21s + -13s

Combine like terms: 21s + -13s = 8s
320 = 8s

Solving
320 = 8s

Solving for variable 's'.

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

Add '-8s' to each side of the equation.
320 + -8s = 8s + -8s

Combine like terms: 8s + -8s = 0
320 + -8s = 0

Add '-320' to each side of the equation.
320 + -320 + -8s = 0 + -320

Combine like terms: 320 + -320 = 0
0 + -8s = 0 + -320
-8s = 0 + -320

Combine like terms: 0 + -320 = -320
-8s = -320

Divide each side by '-8'.
s = 40

Simplifying
s = 40

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