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Sagot :

A.
2x+5=1
2x=1-5
2x=-4
x=-4/2
x=-2

B
-7=4x-3
-7+3=4x
-4=4x
x=4/-4
x=-1

C
-t/5=1/2
-t=1/2*(-5)
-t=-2,5

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