Question

(x-5)2-2x=3•(x-10)-1

Answer 1

(x-5)2-2x=3•(x-10)-1

2x - 10 - 2x=3x-30-1

-10=3x-31

3x=21

x=7

Answer 2

$(x - 5)2 - 2x = 3.(x - 10) - 1 \\ (x - 5)2 - 2x = 3x - 30 - 1 \\ 2x - 10 = 3x - 30 - 1 \\ 2x - 3x = - 30 - 1 + 10 \\ x = 31 + 10 \\ x = 21$