bài 1.tìm x x+18=6-2.x 17-x=7-6.x X+15=20-4.x 7.x-4=20-4.x -12+x=5.x-20 4.x-18=x+27 2.(x-5)-3.(x+7)=14 5.(x-6)-2.(x+3)=12 -7.(5.x)-2.(x-10)=15 4.(x-5)-(x+7)=-19 7.(x-3)-5.(3-x)=11.x-5

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