float x = 7001.1;
float MULT = 0.00;
long RPM = 0;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);

}

void loop(){

  MULT = x * 60;
  RPM = MULT / 7;

Serial.print(x);
Serial.print(" * 60 = ");
Serial.println(MULT);

Serial.print("RPM = ");
Serial.print(MULT);
Serial.print(" / 7 = ");
Serial.println(RPM);

delay(600000);
}