x＞4;
10×4+(30-10-1)x＜176;
19x＜136;
x＜136/19
10×4+(30-10)x≥176;
40+20x≥176;
20x≥136;
x≥34/5;
∴34/5≤x＜136/10;
x可以为7,8,9