s*7-40=100

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Solution for s*7-40=100 equation: 



s*7-40=100

We move all terms to the left:

s*7-40-(100)=0

We add all the numbers together, and all the variables

s*7-140=0

Wy multiply elements

7s-140=0

We move all terms containing s to the left, all other terms to the right

7s=140

s=140/7

s=20

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