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2. 30y+20z+10= 60yz
3. 5+5= 10
4. 10+10= 20
5. 8+8= 16
6. 4x+4x= 8x
7. 1+1= 2
8. 2+2= 4
9. 12+12= 24
10. 6+6= 12
50+380= 430
10+35= 45
12+36= 48
8+54= 62
44+53= 97
999+123= 1122
47+98= 145
14+12=26
76+156= 232
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