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7(3s+10)=259
We move all terms to the left:
7(3s+10)-(259)=0
We multiply parentheses
21s+70-259=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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