private int indOfOutP( char op, String equ ){
		int PDepth = 0;
		
		for (int i = 0; i < equ.length(); i++){
			if (equ.charAt(i) == '(')
				PDepth++;
			else if (equ.charAt(i) == ')')
				PDepth--;
			else if (PDepth == 0){
				if (equ.charAt(i) == op)
					return i;
			}
		}
		return -1;
	}