How many solutions are in -5=-5

What is the first step of an indirect proof of a number that is divisible by two

Lance lived in portugal and brazil for a total of 14 months to learn portuguese. he learned an average of 130 new words per month when he lived in portugal, and an average of 150 new words per month when he lived in brazil. in total he learned 1920 new words. write a system of equations to represent the situation. use x to represent portugal, and y to represent brazil

If 3x+8=3x+8 is it one solution or no solution