Resposta :
[tex]\large\boxed{\begin{array}{l} \rm{2x + 20 = 50} \\ \rm{2x = 50 - 20} \\ \rm{2x = 30} \\ \rm{x = \dfrac{30}{2} } \\ \huge\boxed{\boxed{\boxed{\boxed{\rm{x = 15}}}}}\end{array}}[/tex]
Resposta:
15
Explicação passo-a-passo:
2x+20=50
2x=50-20
2x=30
x=30/2=15