(3x-5y)-(3x-2y)等于几

(3x-5y)-(3x-2y)等于几 x+3=5-y,那么x+y等于几 2x等于5y,2z等于3y求3x等于几z (x+3y)(x-3y)-2y(x-y)等于几? x-3=0 2x-5y=9 X,Y 等于几? 4x-3y= -5,4y+3x=3；x、y等于几 2x-5y=7 2x+3y=1 求x,y等于几 2X+8Y=17,3X+5Y=7,X和Y,等于几? (X+Y)^2等于几 x、y等于几 X加Y等于8,2X加3Y等于.4X加3Y等于几?2x加3y等于17 3x+2y=4y+3z=5z+5x,请问x:y:z等于几比几比几? 3x减y等于2,则3减3x加y等于几 2x-3等于y xy等于209,那么x和y是几? ·若x.y互为相反数,且（x+y+3)(x-y-2)=6,则x等于几 若X等于3Y减2,Y等于2x减3,则X等于几 3x-2y等于75 3y-2x等于5 x=?Y=? 如果|x-2y+1|+|2x-y-5|=0 .x+y等于几