數學問題(P.S.連詳細步驟Thanks)

1)
2(2a+3)-3(a+1)=5
4a+6-3a-3=5
4a-3a=5-6+3
a=2

2)
5x-3(x+6)=9-x
5x-3x-18=9-x
5x-3x+x=9+18
3x=27
x=9

3)
2(3y-7)-5(y-2)=6(y-4)
6y-14-5y+10=6y-24
6y-5y-6y=-24+14-10
-5y=-20
y= -20/-5
y=4

你好~
解答過程如下, 請細閱:

1)

2(2a+3)-3(a-1)=5
4a+6-3a+3=5
a+9=5
a=-4

2)

5x-3(x+6)=9-x
5x-3x-18=9-x
3x-18=9
3x=27
x=9

3)

2(3y-7)-5(y-2)=6(y-4)
6y-14-5y+10=6y-24
y+20=6y
5y=20
y=4

希望可以幫到你la~

1) 2 ( 2 a + 3 ) - 3 ( a + 1 ) = 5
4a+6-3a-3=5
4a-3a=5+3-6
a=2
2) 5 x - 3 ( x + 6 ) = 9 - x
5x-3x-18=9-x
5x-3x+x=9+18
3x=27
x=9
3) 2 ( 3 y - 7 ) - 5 ( y - 2 ) = 6 ( y - 4 )
6y-14-5y+10=6y-24
6y-5y-6y=-24+14-10
-5y=-20
y=20/5
y=4