① 3乘(3x+5)= 2乘(2x-1)
9x+15=4x-2
9x-4x=-2-15
5x=-17
x=-五分之十七
② -3(x-3)=3x+4
-3x+9=3x+4
-3x-3x=4-9
-6x=-5
③ 3(3y-1)-12=2(5y-7)
9y-3-12=10y-14
9y-10y=-14+3+12
-y=1
y=-1
④ 4(5y+4)+3(y-1)=24-(5y-5)
20y+16+3y-3=24-5y+5
20y+3y+5y=24+5-16+3
28y=16
y=7分之4
① 3乘(3x+5)= 2乘(2x-1)
9x+15=4x-2
9x-4x=-2-15
5x=-17
x=-五分之十七
② -3(x-3)=3x+4
-3x+9=3x+4
-3x-3x=4-9
-6x=-5
③ 3(3y-1)-12=2(5y-7)
9y-3-12=10y-14
9y-10y=-14+3+12
-y=1
y=-1
④ 4(5y+4)+3(y-1)=24-(5y-5)
20y+16+3y-3=24-5y+5
20y+3y+5y=24+5-16+3
28y=16
y=7分之4