七年级上册数学解方程3(y+1) 2(x-2)-3(3x+2)=x+6 3(x-7)-2[9-4(2-x)]=22 x-1/3[x-1/3(x-9)]=1/9(x-9)3(y+1)=(2y-1) 2x-5=7 14x-3(20-x)=5x-3(8-x)
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