根据相反数的意义可得：（7-2x）+（5-x）=0，
解得：x=4；
故选A．
Which intervention has the highest priority when providing skin care to a bedridden client
A. Changing the bed linens frequently for an incontinent client.B. Keeping the skin clean and dry without using harsh soaps.C. Gently massaging the skin around the pressure areas.D. Rubbing moisturizing lotion over the pressure areas.
下列说法正确的是（ ）
A．H＜0，S＞0的化学反应一定能自发进行
B．得电子难的物质，失电子一定易。
C．可根据分散质直径大小，把“烟”“雾”区别开来。
D．铜作阳极电解盐酸：
H＜0，
S＞0的化学反应一定能自发进行