1)2x+7y-5y-6x+9=2y-4x+97a+3b-5a-9b-11=2a-6b-11x-4y-5-9y-2x= -x -13y-52)4-(5-6x) =4-5+6x2+(7x+3)=2+7x+312-(5c-6)=12-5c+615+(9-4a) =15+9-4a6-(11m-4)=6-11m+45+(4n-2)=5+4n-23)2(3x-4)=3+x6x-8=3+x6x-x=3+85x=11|:5x=2.23(x+1)=7x+53x+3=7x+53x-7x=5-3-4x=2|:(-4)x=-0.54(2-3x) =9-7x8-12x=9-7x-12x-7x=5-9-19x=-4|:-19x=4/19