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2. 3x + 1 / 4 < x - 3 / 2
(3x + 1 / 4) x 4 < (x - 3 / 2) 4
3x + 1 < 2x - 6
3x - 2x < - 6 - 1
x < -7
3. 5x + 5 = 2x - 15
5x - 2x = -15 - 5
3x = -20
x = - 20/3
4. 2x - 1/2 = x + 3/4
(2x - 1/2) 4 = (x + 3/4) 4
8x - 2 = 4x + 3
8x - 4x = 3 + 2
4x = 5
x = 5/4
6. L = d1 x d2 / 2
300 = 30 x d2 / 2
300 = 15 x d2
d2 = 300 / 15
d2 = 20
7. kll = 4s
160 = 4s
s = 160 / 4
s = 40
L = s x s
= 40 x 40
= 1600
9. 3x + 120 = 180
3x = 120 - 180
3x = 60
x = 60 / 2
x = 30
maaf, nomor 5, 8, sama 10 nggak bisa aku jawab, nggak tau caranya