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(4x-1)² - (2x-3)² = (4x-1 + 2x-3) (4x-1 -(2x-3) )
= (6x - 4) (2x+2)
= 2 (3x-2) 2 (x+1)
salah satu faktor : (x+1)
47)
48)
-------------------------- x 3
6 + x = 9
x = 9-6
= 3
49)