Sagot :
5x-7=9
5X=7+9
5X÷5=16÷5
X=3,2
7a+6=69
7a=69-6
7a÷7=63÷7
A=9
6x-5=4x+9
6X-4X=9+5
2X÷2=14÷2
X=7
3x+7=8x-1
3X-8X=-1-7
-5x÷-5=-8÷-5
X=8/5
x/4+3=5
X/4=5-3
X/4=2
X=4×2
X=8
Réponse :
Bonjour,
5x-7=9<=>5x=16<=>x=16/5
7a+6=69<=>7a=69-6<=>7a=63<=>a=63/7<=>a=9
x/4+3=5<=>x/4=2<=>x=8
6x-5=4x+9<=>6x-4x=9+5<=>2x=14<=>x=7
3x+7=8x-1<=> -5x=-8<=>x=8/5
Bonne journée