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OpenStudy (anonymous):
-{[2a+3(a-b)]-[4a-(b-3)]}
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OpenStudy (angela210793):
-[(2a+3a-3b)-(4a-b+3)]=-[5a-3b-4a+b-3]=-a+2b+3
OpenStudy (anonymous):
{-a+2 b+3}
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