-3/4 + -7/12 = (-3×3)/(4×3) + -7/12 = -9/12 + -7/12 = (-9 + -7)/12 = -16/12 = (-4×4)/(3×4) = -4/3 = -1 1/3.
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1/3 + 1/4 = 4/12 + 3/12 = 7/12
1/12 + 4/6 = 1/12 + 8/12 = 9/12 = 3/4.3 over 4 is 1 over 12 plus 4 over 6.
It's 15/12 .
3/4 + 5/6 = 9/12 + 10/12 = 19/12 = 17/12
1 1/3 or 4/3