Question

Determ valoare nr reale m stiind ca 3 este solutie a ecuatiei : 4x(m+1)-5mx+7=2m-5

Answer 1

acesta este raspunsul dorit

Answer 2

$\displaystyle 4x(m+1)-5mx+7=2m-5 \\ 4 \cdot 3(m+1)-5m \cdot 3+7=2m-5 \\ 12(m+1)-15m+7=2m-5 \\ 12m+12-15m+7=2m-5 \\ 12m-15m-2m=-5-12-7 \\ -5m=24 \Rightarrow m= \frac{24}{5}$