Bonjour,

a)

5x=2-3 = -1

b)

2y = 15+5

2y = 20

y = 20/2 = 10

c)

3x= -2-13

3x = -15

x= -15/3 = -5

d)

-8-13 = 7x

7x = -21

x= -21/7 = -3

e)

4t = -7 +6

4t = -1

t= -1/4 = -0,25

f)

42+7 = 2x

2x =49

x= 49/2 =24,5

g)

3y = 4 +1/2

3y = 8/2 +1/2

3y = 9/2 = 4,5

Y = 4,5/3 =1,5

h)

2n = 1/10 +2/5

2n =1/10 + 4/10

2n = 5/10 = 0,5

n= 0,5/2 =0,25

i)

x/2 = 5 +3/2

x/2 = 10/2 + 3/2

x/2 = 13/2 =6,5

x= 6,5 * 2 = 13

j)

3t/7 = 2/35 +2

3t/7 = 2/35 + 70/35

3t/7 = 72/35

t = (72/35 ) /(3/7)

t =72/35 * 7/3

t =504/105  = 168/35 =24/5