tolong jawab yang bener pake cara.

1) A

2) 30 + 6x = 12
6x = 12 - 30
6x = - 18
x = - 3 ( B )

3) - 2x = 6
x = - 3
a) x = - 3 ( ekivalen )
b) 2x + 6 = 0
2x = - 6
x = - 3 ( ekivalen )
c) 4x = 12
x = 3 ( tdk ekivalen )
d) ⅔x = - 2
x = - 2 ÷ ⅔
x = - 2 × 3/2
x = - 3 ( ekivalen )
jadi yg tdk ekivalen adalah ( C )

4) 4x + 18 = 6 - 2x
4x + 2x = 6 - 18
6x = - 12
x = - 2 ( C )

5) 4 ( 2y - 3 ) = 4y + 10
8y - 12 = 4y + 10
8y - 4y = 10 + 12
- 4y = 22
y = - 22/4
y = - 5 2/4
y = - 5 ½ ( D )

6) 4(2y + 3) - 2y = 3(4y + 3)
8y + 12 - 2y = 12y + 9
6y - 12y = 9 - 12
- 6y = - 3
y = ½
nilai y + 5
= ½ + 5
= 5½ ( C )

7) 3(2x - 5) + 2(4x + 7) = 5(3x + 1 )
6x - 15 + 8x + 14 = 15x + 5
14x - 1 = 15x + 5
14x - 15x = 5 + 1
- x = 6
x = - 6 ( D )