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Dua sisi segitiga > satu sisi segitiga
4x + 5 + 2x + 4 > 40
6x + 9 > 40
6x > 40 - 9
6x > 31
x > 31/6
4x + 5 + 40 > 2x + 4
4x + 45 > 2x + 4
4x - 2x > 4 - 45
2x > -41
x >-41/2
2x + 4 + 40 > 4x + 5
2x - 4x > 5 - 40 - 4
-2x > -39
x < 39/2
mak, 31/6 <x < 39/2
x terkecil adalah , 6 (asli)