s+s*20=189

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Solution for s+s*20=189 equation: 



s+s*20=189

We move all terms to the left:

s+s*20-(189)=0

Wy multiply elements

s+20s-189=0

We add all the numbers together, and all the variables

21s-189=0

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

21s=189

s=189/21

s=9

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