Question

Dau coroana!!
E foarte urgent..
1.Rezolvati in Z:
a) -43-17x=-9-16x
b) 5×(x+1)=2x+7
c) 4=5×(x+1)-6
d) (x+3)×(x+7)=0
e) (-2x+6)×(x+3)=0
f) -4-{6-[-3+(-3)+(-5-x)-7]-9}=1

Answer 1

a) -43-17x=-9-16x
-17x+16x=-9+43
-x=34
x=-34

b) 5×(x+1)=2x+7
5x+5=2x+7
5x-2x=7-5
3x=2
x=2/3
x=0,(6)

c) 4=5×(x+1)-6
4=5x+5-6
4=5x-1
5x=4+1
5x=5
x=5:5
x=1

f) -4-{6-[-3+(-3)+(-5-x)-7]-9}=1
 -4-[6-(-3-3-5-x-7)-9]=1
 -4-[6-(-18-x)-9]=1
 -4-[6+18+x-9]=1
-4-(15+x)=1
-4-15-x=1
x=-19-1
x=-20