solve:1. 0.4b-2/1.5b+15 =2/3
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Answer:
0.4×1.5 b - 2b+15×1.5=2/3× 1.5
0.60b -2b+22.5=1
-1.40b =1-22.5
-1.40 b =-21.5
1.4b=21.5
b =21.5/1.4
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