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43 = 2x+3x+4x +1-3
43 = 9x - 2
-9x = -45
x = 5
⇒2x = 2.5 = 10
⇒3x+1 = 3.5 + 1 = 16
⇒4x-3 = 4.5 - 3 = 17
⇔sisi terpendek adalah 10cm