Question

Numarul 2 este solutie a ecuatiei kx+5=x-1
Aflati solutiia ecuatiei k(x-1)=3x+7

Answer 1

daca x=2 rezulta 2k+5=2-1
2k=1-5
2k=-4
k=-4/2
k=-2

kx-k=3x+7
kx-3x=7+k
x(k-3)=k+7
x=(k+7)/(k-3)    conditie k≠3
k+7=0
k=-7