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(x -3) (x-7) = 0
x = 3 atau x = 7
itu hp nya
= ( x² - 3x ) - ( 7x +21 )
= x( x - 3 ) - 7 ( x - 3 )
= ( x- 7 ) ( x - 3 )
x - 7 = 0
x = 7
x - 3 = 0
x = 3