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I need some simple equations that equal 12,20,21,31.
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I need some simple equations that equal 12,20,21,31.

User Madmadi
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(3 • 2) • 2 = 12, (3 • 7) - 1 = 20, (3 • 2) + (3 • 5) = 21, (6 • 5) +1 = 31
User Inshallah
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2*(3+6)=12      (2*2)*5=20            (3*4)*7=21     1+(5*6)=31
User Jenneh
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