解方程：（x-3)÷2=7.5 3x+x=30 15x+x=40 2.5x-6=18.5 3x+7=59.2

解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6) 解方程(x-2)/(x-3)-(x-3)/(x-4)=(x-5)/(x-6)-(x-6)/(x-7) 解方程(x+1/x+2)-(x+2/x+3)=(x+5/x+6)-(x+6/x+7) 解方程：x+2/x+1-x+3/x+2=x+6/x+5-x+7/x+6 解方程:(x+3)/(x+2)-(x+5)/(x+4)=(x+7)/(x+6)-(x+9)/(x+8) 解方程 x+2/x+1+x+8/x+7=x+6/x+5+x+4/x+3 解方程:2(X-3)(X+5)=X平方+(X+2)(X-2)+(X+7) x/(x-2)+(x+1)/(x-6)=2x/(x-3) 解分式方程 解方程：(x-2)(x^2-6x-9)=x(x-5)(x-3) 解分式方程 x-7/x-9+x-3/x-5=x-4/x-6+x-6/x-8 解方程】(x+8)/(x-3)-(x-9)/(x-4)=(x+7)/(x+8)-(x+2)/(x+3) 解方程：（x-8）/(x-3)-(x-9)/(x-4)=(x+7)/(x+8)-(x+2)/(x+3)