bonjour ??

.a. –3 + x = 7

-3 + 3 +x = 7 + 3

x = 10

b. x + 8 = 11

x + 8 - 8 = 11 - 8

x = 3

c. 5x = 19

x = 19/5= 3,8

d. –2x = 9

x = -9/2 = - 4,5

e. 3x + 7x = 50

10x = 50

x= 50/10 = 5

et

f. –4x + 9x = 45

5x = 45

x = 45/5 = 9