1). 4x+2y-5x-8y= -x-6y; 2). 3*(4a-9)+5=12a-27+5=12a-22; 3). 10a-(a-4)+(3a-2)=10a-a+4+3a-2=12a+2.
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1). 4x+2y-5x-8y= -x-6y; 2). 3*(4a-9)+5=12a-27+5=12a-22; 3). 10a-(a-4)+(3a-2)=10a-a+4+3a-2=12a+2.