Emma has 53 marbles she gets some marbles from Fred then she gives 10 marbles to yessir she how has 58 how many does she gets from Fred

53 + x - 10 = 58 (x = marbles Fred gave)

53 + x = 68 (use operations on both sides, subtract 10 from left side and add 10 to right side)

x = 68-53 (switch the placement around)

x = 15

Fred gave her 15 marbles.