Question

-3(а-5)+2(3а+15)при а=-7; (а-3)х=5х+4равен 4

Answer 1

-3a+10+6a+30
27+10-42+30=25

ax-3x=5x+4
4x-3x=5x+4
x-5x=4
-4x=4
x=-1

Answer 2

-3(а-5)+2(3а+15)= -3(-7-5)+2(-7*3+15)=36-2=34