Five times the quantity of half a number plus seven is triple a number minus ten.

Answer 1

5(x/2 + 7) = 3x-10

5x/2 +35 = 3x-10

x/2 = 35+10 = 45

x =2(45) = 90

x =90

(UNLESS you meant to write 5(x/2+7) = 3(x-10), although that seems unlikely given the way you used "quantity" for the left side, but not for the right side. BUT if you intended to write that, then 5x/2 +35 = 3x-30 and x/2 = 65, with x= 130)