Question

1)1350+5(у+100)=15(у-10)-589
2)17(х+13)-19(х-21)+249=25(5х-53)-3(7х+576)
6)85z-27-19(1+z)=43(1-z)+91+91z

Answer 1

1)1350+5(y+100)=15(y-10)-589
1350+5y+500=15y-150-589
5y-15y=-1350-500-150-589
-10y=-2589
y=258.9

2)17(x+13)-19(х-21)+249=25(5х-53)-3(7х+576)
17x+221-19x+399+249=125x-1325-35x-1728
17x-19x-125x+35x=-221-399-249-1325-1728
-92x=-3922
x=43

6)85z-27-19(1+z)=43(1-z)+91+91z
85z-27-19-19z=43-43z+91+91z
85z-19z+43z-91z=27+19+43+91
18z=180
z=10