bonjour
a) x + 12 = 25
x = 25 - 12
x = 13
b) x - 51 = - 10
x = - 10 + 51
x = 41
c) 6x = 42
x =[tex]\frac{42}{6}[/tex]
x = 7
d) - 5 x = 255
x = [tex]\frac{255}{-5}[/tex]
x= - 51
e) 2x + 6 = 0
2x = -6
x = [tex]\frac{-6}{2}[/tex]
x = - 3
f) -7-3x = 19
- 3x = 19 + 7
- 3x = 26
3x = - 26
x = [tex]\frac{-26}{3}[/tex]
g) 12 - x = 3x
-3x - x = - 12
4x = 12
x = [tex]\frac{12}{4}[/tex]
x = 3
h) 4+8x = 11 - 3x
8x + 3x = 11 - 4
11x = 7
x = [tex]\frac{7}{11}[/tex]
i ) 9 x - 2 = 8 - x
9x + x = 8+2
10 x = 10
x = 1
j) 12x + 22 = 6x + 30
12x - 6x = 30 - 22
6x = 8
x = [tex]\frac{3}{4}[/tex]
x = 0 .75
