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2(- 5x + 3) + 7(3x - 1) = 0
- 10x + 6 + 21x - 7 = 0
11x - 1 = 0
11x = 1
x = 1/11

S= { 1/11 }

5(4x + 3) - 2(x + 6) = 3(x + 8)
20x + 15 - 2x - 12 = 3x + 24
18x + 3 = 3x + 24
18x - 3x = 24 - 3
15x = 21
x = 21/15
x = 7/5

S= { 7/5 }

bonjour

a ) - 10 x + 6 + 21 x - 7 = 0
     - 10 x + 21 x = - 6 + 7
      11 x = 1
           x = 1/11

b) 20 x + 15 - 2 x - 12 = 3 x + 24
    20 x - 2 x - 3 x = 24 + 12 - 15
    15 x = 21
         x = 21/15
         x = 7/5