X = 13
3x + 16 = 5x - 10
Take the 3x and change the symbol making it -3x and subtract them on both sides, which would be under 3x and 5x giving you
16 = 2x - 10
Take the negative 10 and change the symbol which would be positive 10 and subtract them in both sides giving you
26 = 2x divide both sides by 2 which gives ur answer of 13 = x. You can also check to see if the answer is right by replacing x on the problems with 13
