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
