48÷z + 879 = 887
48÷ z = 887 - 879
48÷z=8
z= 48÷8
z= 6
----------------------------
48÷6+879=887
8+879=887
887=887
974 - b÷7=869
b÷7= 974-869
b÷7= 105
b= 105×7
b= 735
---------------------------
974 - 735÷7=869
974 - 105=869
869=869
y÷2 -275=145
y÷2=145+275
y÷2= 420
y=420×2
y=840
----------------------------
840÷2 - 275=145
420-275=145
145=145