接下
900-30x-6x+30=300+2X =>630=38x ; x=630/38500-5x/3=3x+100 =>1500-5x=9x+300 => 14x=1200 x=1200/14=600/7600-5x+6x-18=4x+300 => 3x=282 x=282/3=947x-1500-3x+15=6x-150 =>2x=-1335 x=-667.515x-200+10x-50=7x+50 => 18x=300 x=300/18=50/3