Question

A letra deconhecida na sentença matemática 2 x n + 3 = 10 + 5 é:
5
4
3
2
1

Answer 1

Resposta:

$2n+3=10+5\\\\2n+3=15\\\\2n+3-3=15-3\\\\2n=12\\\\\frac{2n}{2}=\frac{12}{2}\\\\n=6$