Solve for m
who can me with this one ?

Subtract -18 from both sides to get m = n - 18

n=18+m

n-18=m

When moving a number or a letter to the other side change the sign from positive to negative.

9/140

Step-by-step explanation:

9/20⋅5/35

Factor the number: 35= 5⋅7

9/20⋅5/5⋅7

Cancel the common factor: 5

9/20⋅1/7

Apply the fraction rule

9⋅1/20⋅7

Multiply the numbers: 9⋅1=9

9/20⋅7

Multiply the numbers: 20⋅7=140

9/140

There's your answer ;)