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-3 + x = 7

x = 7 + 3 = 10

5x = 19

x = 19/5

3x + 7x = 50

10x = 50

x = 50/10 = 5

x + 8 = 11

x = 11 - 8 = 3

-2x = 9

x = -9/2

-4x + 9x = 45

5x = 45

x = 45/5 = 9

Bonjour,

Résoudre les équations:

-3+x = 7

x= 7+3

x= 10

S= { 10 }

5x = 19

x = 19/5

S= { 19/5 }

3x+7x = 50

10x= 50

x= 50/10

x= 5

S= { 5 }

x + 8 = 11

x= 11-8

x= 3

S= { 3 }

-2x= 9  

x= -9/2

S= { -9/2 }

-4x+9x = 45

5x= 45

x= 45/5

x= 9

S= { 9 }