10.rb

class Equation

  def read
    File.open("./input", "r") do |file|  
      file.each_line do |line|
        sum(line.split)
      end
    end    
  end

private 
  
  def sum(args)
    res = [] 
    for i in -100..100 do
      result = 0
      args.each_with_index do |value, index|
        value = value.to_i
        result += value * i ** ((args.size - 1) - index)
      end 
      res << i if result == 0  
    end
    show(res)
  end

  def show(res)
    puts "SUM #{res}"
  end
 
end


check = Equation.new
check.read

input

1 -3 0 0
3 -15 18 0
1 -7 -33 135