Răspuns :
x ∈ R2(x+1)-7(x-3)=3(x+10)+1
x=?
2(x+1)-7(x-3)=3(x+10)+1
2·x+2·1-7·x+7·3=3·x+3·10+1
2x+2-7x+21=3x+30+1
2x-7x-3x=30+1-2-21
-8x=8
x=8:8
x=1
x ∈ R ⇒S={1}
Idk, sa te uiti peste inmultire sa vezi daca n-am gresit la semne.
x=?
2(x+1)-7(x-3)=3(x+10)+1
2·x+2·1-7·x+7·3=3·x+3·10+1
2x+2-7x+21=3x+30+1
2x-7x-3x=30+1-2-21
-8x=8
x=8:8
x=1
x ∈ R ⇒S={1}
Idk, sa te uiti peste inmultire sa vezi daca n-am gresit la semne.