tolong bantu ya besok di kumpulin nih, aku gk ngerti

Persamaan

1.
x + 1 - (x-2)/(3) = 3 .....kalikan 3
3x + 3 - (x-2) = 9
3x + 3 - x + 2 = 9
2x + 5 = 9
2x = 9-5
2x = 4
x = 2

2.
(2x+1)² =  (x-1)² + 3x(x+2)
4x² + 4x + 1= x² -2x +1 + 3x² + 6x
4x² + 4x + 1 = 4x² + 4x + 1
ruas kiri  = ruas kanan
mak x ∈ semua bilangan real