4道方程题,73-3(x-1)=706 2:2(2x-15)=6(4x-9)3.(x-8)÷2=(2x-2)÷3 4:5

1:73-3(x-1)=706 73-3x+3=706 -3x=706-76 x=-210
2:2(2x-15)=6(4x-9) 4x-30=24x-54 20x=24 x=6/5
3.(x-8)÷2=(2x-2)÷3 3x-24=4x-4 x=-20
4:50-7(3-y)=(y+7)+25 50-21+7y=y+32 6y=3 y=1/2