Resposta:
x = 8
Explicação passo a passo:
8x = 74 - 10
8x = 64
x = 64:8
[tex]\Large\boxed{\begin{array}{l}\sf8x+10=74\\\sf 8x=74-10\\\sf 8x=64\\\sf x=\dfrac{64}{8}\\\\\sf x=8\blue{\checkmark}\end{array}}[/tex]
