42=7(s-81)

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Solution for 42=7(s-81) equation:


Simplifying
42 = 7(s + -81)

Reorder the terms:
42 = 7(-81 + s)
42 = (-81 * 7 + s * 7)
42 = (-567 + 7s)

Solving
42 = -567 + 7s

Solving for variable 's'.

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

Add '-7s' to each side of the equation.
42 + -7s = -567 + 7s + -7s

Combine like terms: 7s + -7s = 0
42 + -7s = -567 + 0
42 + -7s = -567

Add '-42' to each side of the equation.
42 + -42 + -7s = -567 + -42

Combine like terms: 42 + -42 = 0
0 + -7s = -567 + -42
-7s = -567 + -42

Combine like terms: -567 + -42 = -609
-7s = -609

Divide each side by '-7'.
s = 87

Simplifying
s = 87

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