10a+3+2a=39
12a+3=39
-3 -3
12a=36
/12 /12
a=3
Wouldn’t u just subtract 7 from 19 since they have the same variable
20= 5 times as many fill ups divide both sides 5 20/5=5/5 times how many fill ups 4=1 how many fill ups so it’s 4 tanks
The answer to this is step 2 because they multiplied when they should of subtracted the 10 and the 12.
