解方程12-2(2x-4)=x-7

解方程：x(3x-4)+2x(x+7)=5x(x-7)+90 5x(x+7)(x+4)=5x(x^2+11X)解方程, 解方程(x²-x+4)x-(x-1)(x²+2)=x+7 1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550必须用解方程 2x+3x=12-7x 解方程 解方程 x+2/x+1+x+8/x+7=x+6/x+5+x+4/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-3)-(x-3)/(x-4)=(x-5)/(x-6)-(x-6)/(x-7) 解方程 (x+2)/(x+1) - (x+4)/(x+3)=(x+6)/(x+5)-(x+8)/(x+7) 解方程12-2(2x-4)=x-7 解方程；x/x-4=5x/x-2 解方程：x(x-4)=(x-2)(x-6) 解方程：(x+5)(x-4)+(4-x)^2-(x-4)(2x-7)=16 (x-1)(x-3)(x-4)(x-12)+5x^2=0解方程 7x(x-6)+3x=4x(2x+5)怎么解这个方程 (x-3)(x+8)=(x+4)(x-7)+2(x+5)解方程, 5x+2x=33.6,7x-4x=0.75,2x+7x+2.1=12,56x-32x-119=361,解方程 解方程1/(x+x﹚+1/(x+3x+2﹚+1/(x+5x+6﹚+1/(x+7x+12﹚=4/21得