Question

Va dau coronița va rog e Urgent!!!!!!​

Answer 1

a-b=6

a)x+3a-3b=20

x+3(a-b)=20

x+3• 6=20

x+18=20 => x=2

b)x•a-x•b+9a-9b=654

x(a-b)+9(a-b)=654

6(x+9)=654

x+9=109=>x=100

c)7a-7b+x=55

7(a-b)+x=55

7•6+x=55=>x=55-42=>x=13

d)13+x-(5a-5b)=2011

13+x-[5(a-b)]=2011

13+x- 5•6=2011

x=2011-43=1968