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36 : 4 = a : 2 →
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→ 9 = a : 2 →
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→ a = 18
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3 • 18 = 54
_____________
36 : 4 = a : 2 →
_____________
→ 9 = a : 2 →
______________
→ a = 18
______________
3 • 18 = 54
_____________