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2))-6+8=2
4))15+(-30)=-15
5))x-16+-15=10. x-31=10. X= 10+31=41
3))X-(-8)=15. X+8=15. X=15-8=7
6))la suma de 2 hermanos= 32. 32-15= 17 el mayor tiene 17
7))2x= 80. X= 80/2=40
8))3x=18. X=18/3=6
9))X+(x+1)=45. X+ x + 1= 45 2x+1=45. 2x= 45-1= 44. X= 44/2= 22
10))Xx2+5= 21. 2x+5=21. 2x= 21-5=16 x=16/2=8
11))Xx3-4=-13. 3x-4=-13. 3x= -13+4= -9 x=-9/3=-3
12))x+15=70. X=70-15= 55
13))x-24=-8. X= -8+24= 16