2 + 2 + 2 + 2 = 8
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If you mean: -4+3+2s = 15 then s = 8
22+22
you do 2 + 2
2s-4 equals 2(s-2). You can find the answer by factoring two out of both numbers.
44 11 4 __2 2 lines go from 44 to 11 and 4 lines go from 4 to both 2s