35 divided by something = 4 remainder 3

This could also be written as

4 multiplied by something add 3 equals 35

4x + 3 = 35

Balance the equation, whatever happens on one side of the equals must happen on the other.

4x + 3 (-3) = 4x

35 ( - 3) = 32

4x = 32

We now know that 4 multiplied by something = 32

We want to find what 1 is

Divide 4 by 4 to get to 1

Do the exact same to 32

32 / 4 = 8

x = 8