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24x x 12<180
24x<180-12
24x<168
x<168/24
x<7
jadinilai x={6,5,4......}
lebar : 12 cm
luas ≤ 180 cm²
L ≤ 180 cm²
p x l ≤ 180 cm²
(2x+1)x12 ≤ 180 cm²
2x+1 ≤ 180 : 12
2x+1 ≤ 15
2x ≤ 15-1
2x ≤ 14
x ≤ 14 : 2
x ≤ 7