246+6a+9b/35+a+b=7.2
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246+6a+9b/35+a+b=7.2
3(82+2a+3b)/35+a+b=7.2
82+2a+3b/35+a+b=7.2/3
82+2a+3b/35+a+b=72/30=12/5
5(82+2a+3b)=12(35+a+b)
410+10a+15b=420+12a+12b
15b-12b=420-410+12a-10a
3b=10+2a
3b-2a=10
i know that's all
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