Whats the answer for this function?

Δabc is dilated by a scale factor of 3 with the origin as the center of dilation to form δa′b′c′. the slope of is -1.2. the length of is p units, the length of is q units, and the length of is r units. the slope of is . the length of is units.

Nine more than four times a number is the same as one less than twice the number. find the number?

How do you solve a question like this?