7s-21=-19+9s

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Solution for 7s-21=-19+9s equation:


Simplifying
7s + -21 = -19 + 9s

Reorder the terms:
-21 + 7s = -19 + 9s

Solving
-21 + 7s = -19 + 9s

Solving for variable 's'.

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

Add '-9s' to each side of the equation.
-21 + 7s + -9s = -19 + 9s + -9s

Combine like terms: 7s + -9s = -2s
-21 + -2s = -19 + 9s + -9s

Combine like terms: 9s + -9s = 0
-21 + -2s = -19 + 0
-21 + -2s = -19

Add '21' to each side of the equation.
-21 + 21 + -2s = -19 + 21

Combine like terms: -21 + 21 = 0
0 + -2s = -19 + 21
-2s = -19 + 21

Combine like terms: -19 + 21 = 2
-2s = 2

Divide each side by '-2'.
s = -1

Simplifying
s = -1

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