點計都計唔明ge數

1.y+7 /5 = 3y
7/5 = 3y--y
7/5 = 2y
7/5 再除 2 = y
y = 7/5 x 1/2
y = 7/10

2.x-4 /2 +x-3 = -5
2x - 4/2 - 3 = -5
2x - 2 - 3 = -5
2x - 5 = -5
2x = -5 + 5
2x = 0
x = 0

1. y + 7 / 5 = 3y
5y + 7 = 15y (將兩邊乘5, 使它當中沒有分數)
7 = 15y - 5y (將y和數字歸類)
-10y = -7
y = 7 / 10
2. x - 4 / 2 + x - 3 = -5
x - 2 + x - 3 = -5 (約簡分數)
2x - 5 = -5
2x = -5 + 5 (將x和數字歸類)
2x = 0
x = 0

1 . y+7 /5 = 3y
y+7/5X5 = 3yX5
y+7 = 15y
y+7-y = 15y-y
7 = 14y
1/2= y
2 . x-4 /2 +x-3 = -5
(x-4+2x-6)/2= -5
3x-10 = -10
3x-10+10=-10+10
3x=0
x=0

y+7=15y 將除5變成5
7=15y-y 將y放另一便，變成15y-y
7=14y
2=y 除了,答案便是2
y=2

第二題唔識