Question

7ab-7ac-=105
a=5
Calculati b-c

Answer 1

deci e 7*a*b-7*a*c

7*5*b-7*5*c=105

il scoatem factor comun pe 35 (7x5)

35*(a-c)=105

a-c=105:35=3

a-c=3

Answer 2

7ab-7ac=105
7a(b-c)=105
7x5(b-c)=105
35(b-c)=105
b-c=3