70x=80(x-2)这道题怎么解?

70x=80(x-2)这道题怎么解? 80%×5x=2x+13,x怎么解 2(x+80)=3(x-70)怎么解 2(x+80)=3(x-70)怎么解 x^2=(x+30)X(x-18)怎么解 x*x+2*x+1=36,x怎么解, x-(x/2+10)-{[x-(x/2+10)]/2+5}=80 怎么解 x-70+x=16怎么解? 1.5x=x+80怎么解 (x-20)/x=80%怎么解 X-X/3=80%怎么解, x-80%x=25怎么解 X(80-X)=750怎么解 (400-X)-X=80怎么解 x*80%+x=135 怎么解 X(80-X)=750怎么解 x(80-x)=750怎么解, x(x+1)=80怎么解