Bonsoir,
a)
x/2 - 4x = -5 - 3
1/2x - 8/2x = -16/2
1x - 8x = -16
-7x = -16
x = 16/7
b)
x+ 1/4 = 3x - 3/5
20/20x + 5/20 = 60/20x - 12/20
20x - 60x = -12 - 5
-40x = -17
x = 17/40
c)
2x - 3/7 = x/3 + 2/5
210/105x - 45/105 = 35/105x + 42/105
210x - 45 = 35x + 42
175x = 87
x = 87/175