Question

Determinati nr natural m pentru care are loc egalitatea :
{13+[25•4-(3•11+3•22)]•m}÷2=13

Answer 1

$\{13+[25\cdot4-(3\cdot11+3\cdot22)]\cdot m\}:2=13 \\ \{13+[100-(33+66)]\cdot m\}=13 \cdot 2 \\ 13+(100-99) \cdot m=26 \\ 13+m=26 \\ m=26-13 \\ m=13$