s*7+21=154

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Solution for s*7+21=154 equation: 



s*7+21=154

We move all terms to the left:

s*7+21-(154)=0

We add all the numbers together, and all the variables

s*7-133=0

Wy multiply elements

7s-133=0

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

7s=133

s=133/7

s=19

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