Question

Aflați x , dacă a+b=8 : a) x+2a+2b=20 , b) 5a+5b-x=12 , c) x+6=23+7a+7b .

Answer 1

x+2•(a+b)=20
x+2•8=20
x+16=20
x=20-16
x=4

5•(a+b)-x=12
5•8-x=12
40-x=12
x=40-12
x=28

x+6=23+7•(a+b)
x+6=23+7•8
x+6=23+56
x+6=79
x=79-6
x=73