1-3s=7

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Solution for 1-3s=7 equation: 


Simplifying
1 + -3s = 7

Solving
1 + -3s = 7

Solving for variable 's'.

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

Add '-1' to each side of the equation.
1 + -1 + -3s = 7 + -1

Combine like terms: 1 + -1 = 0
0 + -3s = 7 + -1
-3s = 7 + -1

Combine like terms: 7 + -1 = 6
-3s = 6

Divide each side by '-3'.
s = -2

Simplifying
s = -2

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