Hi!!
Calculons :
1) 5x = 3x + 3
5x -3x = 3
2x = 3
[tex]x = \frac{3}{2} [/tex]
2) 12a + 4 = 8a
12a - 8a = -4
4a = -4
[tex]a= - 1[/tex]
3) 4 - 7y = 10y
-7y - 10y = -4
- 17y = -4
[tex]y = \frac{4}{17} [/tex]
4) 6x + 1 + x = -4 -x
6x +x +x = -4 -1
8x = -5
[tex]x = \frac{ - 5}{8} [/tex]
5) 2 + 3p = 7 -2p -p
3p +2p +p = 7-2
6p = 5
[tex]p = \frac{5}{6} [/tex]
6) b/2 + 3/2 = 9² - 4b
b/2 + 4b = 9² - 3/2
(b + 2(4b)) /2= 81 - 3/2
(b + 8b)/2 = -243/2
9b/2 = -243/2
9b = 2(-243/2)
9b = -243
b = -243/9
b= -27
[tex]b = 17.67[/tex]
7) p = 9 + 1 × (0,1×10+9) ÷ (-5)
p= 9 + 1 × (10)÷ (-5)
p= 9 + 1 × (-2)
p= 9 - 2
[tex]p= 7[/tex]