tolong dibantu yaa no 6 & 7 pake cara

7) 4/10 = x/55
4(55) = x(10)
220=10x
x=220/10
x=22cm

6) x/12= 6/9
x(9)=6(12)
9x=72
x=72/9
x=8cm

4/6 = 4+y/9
4(9)=(4+y)6
36=24+6y
36-24=6y
12=6y
y=12/6
y=2cm