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Sagot :

Réponse:

a. x+7=8

x=7-8

x=1

b. t-9=3

t=9+3

t=12

c. y+15=7

y=-15+7

y= -8

d.4z=-7

z=(-7)÷4

z= -7/4

e. -z=-8

z=(-8)÷(-1)

z= 8/1

f. 7x=4

x=4÷7

x=4/7

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