1) 2a-b-7a+9b= 9b-5a
2) 12-5(4c-3)=12-20c+15= 27 -20c
3) 12х+(3х-4)-(6х+5)= 9x-9
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1) 2a-b-7a+9b= 9b-5a
2) 12-5(4c-3)=12-20c+15= 27 -20c
3) 12х+(3х-4)-(6х+5)= 9x-9