É URGENTE!! Calcule o valor de x
A){x + y = 42
{x - y = 36

B){x + y = 38
{2 x - y =10

C){4 x + y = 60
{5 x - y = 03

D){7 x + y = 60
{x - y =12

E){4 x + y = 18
{x - y = 7

F){6 x + y = 13
{x - y = 8

G) {2 x + y = 30
{x - y = 03

H){5 x + y =26
{ x - y =10

I) {5 x + y = 30
{ x - y = 6
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