Sagot :
1. 4x5+4x5=10xX+10x(-3)
20+20=10X-30
-10X=-40-30
-10X=-70
-10X/10=-70/10
X=7
2. -2xX-2x5=3x2+3x(-4X)
-2X-10=6-12X
-2X+12X=10+6
10X=16
10X/10=16/10
X=1,6
Les 2 autres je sais pas
4x/3 - 3/5 = 3x + 1/2
<=> 4x/3 - 3x = 1/2 + 3/5
<=> -5x/3 = 11/10
<=> x = (11/10)(-3/5)
<=> x = -33/50