Bonjour,
a)
5x = 2-3
5x= -1
x= -1/5
b)
2y = 15+5
2y = 20
y= 20/2 = 10
c)
3x = -2-13
3x = -15
x= -15/3 = -5
d)
-8-13 = 7x
-21= 7x
x= -21/7 = -3
e)
4t = -7+6
4t = -1
t= -1/4 =-0,25
f)
42+7 = 2x
49 = 2x
x= 49/2 =24,5
g)
3y = 4+1/2
3y = 8/2 + 1/2 = 9/2 = 4,5
y = 4,5/3 = 1,5
h)
2n = 1/10 + 2/5 = 1/10 + 4/10 = 5/10 = 0,5
n= 0,5/2 = 0,25
i)
x/2 = 5+3/2 = 10/2 + 3/2 = 13/2 = 6,5
x/2 = 6,5
x= 6,5 * 2 = 13
j)
3t/7 = 2/35 +2 = 2/35 + 70/35 = 72/35
3t = 72/35 *7 = 504/35
t= (504/35 )/3
t= 504/35 * 1/3= 504/105 = 4,8
