5s-7=s+21

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Solution for 5s-7=s+21 equation:


Simplifying
5s + -7 = s + 21

Reorder the terms:
-7 + 5s = s + 21

Reorder the terms:
-7 + 5s = 21 + s

Solving
-7 + 5s = 21 + s

Solving for variable 's'.

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

Add '-1s' to each side of the equation.
-7 + 5s + -1s = 21 + s + -1s

Combine like terms: 5s + -1s = 4s
-7 + 4s = 21 + s + -1s

Combine like terms: s + -1s = 0
-7 + 4s = 21 + 0
-7 + 4s = 21

Add '7' to each side of the equation.
-7 + 7 + 4s = 21 + 7

Combine like terms: -7 + 7 = 0
0 + 4s = 21 + 7
4s = 21 + 7

Combine like terms: 21 + 7 = 28
4s = 28

Divide each side by '4'.
s = 7

Simplifying
s = 7

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