1) x : 9 = 13
x = 13 • 9
x = 117
2) 17 • 3 + y = 72
51 + y = 72
y = 21
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1) x : 9 = 13
x = 13 • 9
x = 117
2) 17 • 3 + y = 72
51 + y = 72
y = 21