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hirondelle52

bonjour;

3x/7 -1/2 = 1/4

3x/7 = 1/4 +1/2

3x/7 = 1/4 +2/4

3x/7 = 3/4

3x = (3/4)*7

3x = 21/4

x = (21/4)/3

x = 21/4 *1/3

x = 21/12 = 7/4 = 1,75

5x/6 +3 = 2x/3-1

5x/6 -2x/3 = -1-3

5x/6 -2x/3 =-4

5x/6 -4x/6 = -4

x/6 = -4

x= -4*6

x = -24

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