7(x — 6) = 3х +9

Helppp

Ihave a 69 and an 82. the 69 is worth 40% of my grade and the 82 is worth 15%. can someone tell me my current average grade.

What are the equivalent ratios for 24/2= /3= /5.5=108/ = /15

What would be the reasons for lines 3 and 4? a. addition property; subtraction property b. addition property; solve c. substitution property; subtraction property d. substitution property; prove