Question

=помогите пожалуйста!! 7(4-t)+3(t-5)=9

Answer 1

28-7t+3t-15=9
-4t=9-28+15
-4t=-4
t=1

Answer 2

7 (4-1)+3 (1-5)=9 21+(-12)=9 28-7t+3t-15=9 -7t+3t=-4th 28-15=13 -4*t=9-13 -4*t=-4 t=-4/-4 t=1