Step-by-step explanation:

7/1 x 3/14 = 21/14 = 3/2 = 1 1/2
The answer is 1 1/12 or 1.5, but I recommend the fraction way since the problem was in fractions!
3x-8+6x=7
9x-8=7
9x=15
x=9/15
x=3/5
First you need common denominator
x/2 - 6/2 = 34/2
now , eliminate denominator
x - 6 = 34 add 6 to both sides and simplify
x=40
Triangular prism and rectangular prism