Question

2000+139+___=1970+160+___

Answer 1

Resposta:

$2000+139+x=1970+160+y\quad :\quad x=y-9$

Explicação passo a passo:

$2000+139+x=1970+160+y$

$x+2139=1970+160+y$

$x+2139=y+2130$

$x+2139-2139=y+2130-2139$

$x=y-9$