Subtract the sum of -3\10 and 5\8 from thr sum of 4\15 and 2\5
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-3/10+5/8
= -3×4/40+5×5/40
= -12/40+25/40
= 13/40
4/15+2/5
=4×1/15+2×3/15
=4/15+6/15
=10/15
13/40÷10/15
=13/40×15/10
=39/80
= -3×4/40+5×5/40
= -12/40+25/40
= 13/40
4/15+2/5
=4×1/15+2×3/15
=4/15+6/15
=10/15
13/40÷10/15
=13/40×15/10
=39/80
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