expected ')' befor numeric constant? new to programming plz help

Using Arduino Programming Questions
1

int sensorPin =0; // pin the sensor is connected to
int ledPin = 9; // led is connected to pin 9

void setup()
{
pinMode(ledPin, OUTPUT); // setting ledPin as an output
// Serial.begin(9600);
}

void loop()
{
//Serial.println(analogRead(sensorPin));
int val = analogRead(sensorPin); // val is the analog read of the sensor

val = constrain(val, 20, 90);

int ledLevel = map (val 20, 90, 255, 0);

analogWrite(ledPin, ledLevel);
}

for some reason i keep getting the messege "expected ')' before numeric constant" but i dont understand what is wrong with code. any corrections would be appreciated

2 
int ledLevel = map (val 20, 90, 255, 0);

20 is a numeric constant. There needs to be something between val and 20.

3

thanks for explaining, i appreciate the help that was the problem