2s-2b= a+b+c-2b
simplified that would be
a+c-b.
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2s-4 equals 2(s-2). You can find the answer by factoring two out of both numbers.
The equivalent is 7s+2s = 9s
It simplifies to: 2s+4R
If 2s = 5 then s = 2.5. So by letting s equal 2.5 (two and one half) you will allow 2s to equal 5.
If you mean: -4+3+2s = 15 then s = 8