а) 7(5а+8)-11а=35а+56-11а=24а+56
б)9х+3(15-8х)=9х+45-24х=-15х+45
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б)9х+45-24х=45-15х
а) 7(5а+8)-11а=35а+56-11а=24а+56
б)9х+3(15-8х)=9х+45-24х=-15х+45