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2x + 3x - 15 = 90
5x -15 = 90
5x = 105
x = 21
nilai AOB = 3(21)- 15
= 63 - 15
= 48
5×= 90+15 = 105
x=21
AOB= 3x- 15
3.(dikali) 21 - 15
63-15
= 48(a)