= -28+7b-6b-6+48-6b=14-5b
-7*4+7b-6b-6+48-6b=-28+7b-6b-6+48-6b=-5b+14
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= -28+7b-6b-6+48-6b=14-5b
-7*4+7b-6b-6+48-6b=-28+7b-6b-6+48-6b=-5b+14