Sagot :
bjr
4x + 7 = 0
les x à gauche et les constantes à droite
4x = -7
x = -7/4
2x - 4 = 3 - 5x
2x - 5x = 3 + 4
-3x = 7
x = -7/3
8x - 7 = -12x + 2
8x + 12x = 2 + 7
20x = 9
x = 9/20
3x - 5 = 0
3x = 5
x = 5/3
4x+7=0 2x-4=3-5x 3x-5=0 8x-7=-12x+2
4x=-7 2x+5x=3+4 3x=5 8x+12x=2+7
4x/4=-7/4 7x=7 3x/3=5/3 20x=9
x=-1.75 7x/7=7/7 x=5/3 20x/20=9/20
x=1 x=0.45