8(3s+7)−10(2s+6)=−4s+19
24s+56-20s-60=-4s+19
24s-20s+4s=19-56+60
8s=23
s =
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8(3s+7)−10(2s+6)=−4s+19
24s+56-20s-60=-4s+19
24s-20s+4s=19-56+60
8s=23
s =
4s-4=-4s+19
4s+4s=19+4
8s=23
s=23:8
s=23/8=2целых7/8