Bonsoir,
-x+1/2=0
x = ½
3/2x-1/4=0
3/2x = ¼
3x = 2/4
x = (½)/3
x = 1/6
-2(-x+3)-4(x-5)= -2x+1
2x-6-(4x-20) = -2x+1
2x-6-4x+20 = -2x+1
2x-4x+2x = 6-20+1
-4x = -13
x = 13/4
3-2x-(1-4x)= -2/3 (x-2)
3-2x-1+4x = -⅔x+4/3
-2x+4x+⅔x = -3+1+4/3
8/3x = -2/3
8x = -2
x = -2/8
x = -¼