7s-21=30+8s

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Solution for 7s-21=30+8s equation:


Simplifying
7s + -21 = 30 + 8s

Reorder the terms:
-21 + 7s = 30 + 8s

Solving
-21 + 7s = 30 + 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.
-21 + 7s + -8s = 30 + 8s + -8s

Combine like terms: 7s + -8s = -1s
-21 + -1s = 30 + 8s + -8s

Combine like terms: 8s + -8s = 0
-21 + -1s = 30 + 0
-21 + -1s = 30

Add '21' to each side of the equation.
-21 + 21 + -1s = 30 + 21

Combine like terms: -21 + 21 = 0
0 + -1s = 30 + 21
-1s = 30 + 21

Combine like terms: 30 + 21 = 51
-1s = 51

Divide each side by '-1'.
s = -51

Simplifying
s = -51

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