Аноны, подскажите в чём ошибка, ебусь час уже

ошибка:

matrix_nakanecta.ino: In function ‘void loop()’:
matrix_nakanecta.ino:30:24: error: expected ‘;’ before ‘)’ token
matrix_nakanecta.ino:37:10: error: expected ‘)’ before ‘;’ token
matrix_nakanecta.ino:42:24: error: expected ‘;’ before ‘)’ token
matrix_nakanecta.ino:49:8: error: expected ‘)’ before ‘;’ token

код:

#include <MaxMatrix.h>

int data = 11; // DIN pin of MAX7219 module
int load = 10; // CS pin of MAX7219 module
int clock = 13; // CLK pin of MAX7219 module

int maxInUse = 1; //change this variable to set how many MAX7219's you'll use (5)

MaxMatrix m(data, load, clock, maxInUse); // define module

byte buffer[10];

int x = 0;
int y = 0;
boolean z = LOW;

void setup()
{
m.init(); // module initialize
m.setIntensity(10); // dot matix intensity 0-15
Serial.begin(9600); // serial communication initialize

}

void loop()
{
if (z = LOW)
{
z = HIGH;
for (x=0, x<=7, x++)
{
m.setDot(x, y, z);
delay(30);
y++;
}
x = 0;
y = 0;
}
else if (z = HIGH)
{
z = LOW;
for (x=0, x<=7, x++)
{
m.setDot(x, y, z);
delay(30);
y++;
}
x = 0;
y = 0;
}

}