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5x + 7 = 3x + 1 = 7x + 17
pertama : 5x + 7 = 3x + 1
5x -3x = 1 - 7
2x = -6
x = -6 : 2
x = -3
kedua: 3x + 1 = 7x + 17
3x - 7x = 17 - 1
-4x = 16
x = 16 : -4
x = -4
kiri:
5x+7 ≤ 3x+1
5x-3x ≤ 1-7
2x ≤ -6
x ≤ -3
kanan:
3x+1 ≤ 7x+17
1-17 ≤ 7x-3x
-16 ≤ 4x
-4 ≤ x
{ -4 ≤ x ≤ 3 }