5y+14=29 → 29-14=15
5y=15 then y =15÷5=3
-7h+4=25
-7h=21 → 21÷-7=-3
h= -3
10j-13=27 → 27+13
10j=40
j=40/10=4
-8g-9=-49
-8g= -40
g=5
and you can check them all by replacing the letter with the number you got and if it's equal the final answer then you're right like in the first one
5(3)+14=29