8x-4=07x+2=0100x+25=0-200x+100=0200x-100=0
1)8x=4 X=4/8=0,5 2)7x=-2 X= -(2/7) 3) 100x=-25 X=-(25/100) X= - 0,25 4) - 200x=-100 X= (-100) / (-200) X= 0,5 2)200x=100 X=100/200 X=1/2 X=0,5