Tìm x, y biết (y- 21 ×13) :11=30

Bài1 a, (y- 21 ×13) :11=30 .
.b,(x+175) :5+30=460+85×4.
.c,15+15×2+7×1515-100.
.d,1,5+2,5+3,5+4,5+5,5+6,5+7,5+8,5.
.e,40×11,3×25-20×11,2×50