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½*72*y+6y=48
36y+6y=48
42y=48
y=48/42
y=1 6/42=1 3/21
b) ½*8*3z+8z +½*2z*8 +½*8*2z - ½*8 *z = 48
12z+8z+8z+8z-4z=48
32z=48
z= 48/32= 1 16/32=1 ½
½*288*y +6y =48
144y+6y=48
150y= 48 /÷150
y=0,32
b) ½*8*3z+8z +½*2z*8 +½*8*2z - ½*8 *z = 48
3z+8z+8z+ 8z- 4z = 48
24z-4z= 48
20z= 48 /÷20
z= 2,4