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bonjour

3 x + 4 = 40

3 x = 36

x = 12

6 x + 7 = 19 + 3 x

6 x - 3 x = 19 - 7

3 x = 12

x = 4

10 x - 5 = 30

10 x = 35

x = 3.5

4 x + 19 = 100 - 5 x

4 x + 5 x = 100 - 19

9 x = 81

x = 9