Simple Equations

Here are some mathematical equations for you to solve.
Can you figure out the answers?

10r + 8 = 48
r =
7x + 4 = 18
x =
3d + 9 = 18
d =
7h - 1 = 20
h =
6l - 6 = 24
l =
6d - 5 = 19
d =
9l - 1 = 80
l =
10u - 10 = 20
u =
2h + 1 = 15
h =
8r + 8 = 40
r =

 

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