int x=7;
int y=34;
int z;
String s1= "the sum of ";
String s2= " is ";
String s3= " & ";
String s4= " = ";
void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  z=x+y;
Serial.print(s1);
Serial.print( x );
Serial.print( s3 );
Serial.print( y );
Serial.print( s2 );
Serial.print( s4 );
Serial.println( z );
delay(1000);
x=x+1;
y=y-21;
}