18+4s-1=42

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Solution for 18+4s-1=42 equation:


Simplifying
18 + 4s + -1 = 42

Reorder the terms:
18 + -1 + 4s = 42

Combine like terms: 18 + -1 = 17
17 + 4s = 42

Solving
17 + 4s = 42

Solving for variable 's'.

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

Add '-17' to each side of the equation.
17 + -17 + 4s = 42 + -17

Combine like terms: 17 + -17 = 0
0 + 4s = 42 + -17
4s = 42 + -17

Combine like terms: 42 + -17 = 25
4s = 25

Divide each side by '4'.
s = 6.25

Simplifying
s = 6.25

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