解方程 21+2x+(7x/2)=7x/2

解方程:2(X-3)(X+5)=X平方+(X+2)(X-2)+(X+7) 解方程(x²-x+4)x-(x-1)(x²+2)=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-3)-(x-3)/(x-4)=(x-5)/(x-6)-(x-6)/(x-7) 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) 解方程 x+2/x+1+x+8/x+7=x+6/x+5+x+4/x+3 解方程：x/(x-2)+(x-9)/(x-7)=(x+1)/(x-1)+(x-8)/(x-6) 解方程⑴ x/（2x^2-11x-21）=（x+7）/(x^2-12x+35) 解方程：7x-2x+3x=36